Explanation:
enzymes are biological catalysts that increase the rate of reaction without being used up in the reaction process.
this is done by providing an alternative route to the reaction progress that'll require a lower activation energy.
example - digestive enzyme Amylase, is used to breakdown sugars into glucose for cellular respiration.
hope it helps. :)
. an organic compound containing c, h, and o was analyzed by combustion. 6.237 g of the compound yielded 8.845 g carbon dioxide and 5.438 g of water. find the empirical formula of the compound. c
The empirical formula of the compound is CH3O
What is Combustion ?
Combustion is an exothermic, high-temperature redox chemical reaction between a fuel (reductant) and an oxidant (usually oxygen in the atmosphere), producing oxidized, often gaseous, gases in a mixture called smoke. A shaped product is produced. Combustion does not always lead to fire, as the flame is only visible when the substance undergoing combustion is vaporized, but when this occurs, the flame is a characteristic indicator of the reaction. Activation energy must be overcome to initiate combustion (for example, by starting a fire using a lit match), but the heat of the flame provides enough energy to make the reaction self-sustaining can provide.
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The dosage for penicillin for infants is 7.2mg per kg of body weight. Determine the dosage in grams. Please help!!
If you take 0.0072 grams, you should Penicillin dose for newborns is 7.2 mg per kilogram of body weight.
Why would someone use penicillin?Infections brought on by bacteria are treated with penicillins. By eradicating the germs or stopping their growth, they function. Penicillins are available in numerous varieties. Different infections are treated with each differently.
Does penicillin work on any bacteria?To treat staphylococcal and streptococcal bacterial infections, penicillin is a common antibiotic that is administered. Penicillin is a member of the antibiotic class known as beta-lactams, whose members all work by preventing the growth of bacterial cells, which eventually results in bacterial eradication.
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Which statement describes a causal relationship between two variables?
The statement that describes a casual relationship between two variables would be a correlation.
What is correlation?Correlation is a statistical term used to describe the relationship between two variables. The strength of the correlation between two variables is measured by a factor known as the correlation coefficient. The correlation coefficient is represented by r.
The value of r ranges from -1 to +1.
A positive r means that the two variables have the tendency to increase together. That is a direct relationship.A negative correlation means the two variables have an inverse relationship. As one is increasing, the other is decreasing, and vice versa.A correlation of 0 means that the two variables have no linear correlation with each otherA correlation of 1 means the two variables are perfectly correlated.Thus, the casual realtionship between two variables is best described as correlation.
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which compound has the shortest carbon-carbon bond length? which compound has the shortest carbon-carbon bond length? ch2ch2 ch3ch3 hcch all bond lengths are the same.
Out of all the compounds - ch2ch2 (Ethylene), ch3ch3 (Ethane)and hcch the compound with the shortest bond length is hcch (Ethyne)
Bond length is the equilibrium distance between the nuclei of two groups or atoms that are bonded to each other.
Bond length depends upon bond strength and is inversely proportional to it, therefore longer the length of bond, less the bond strength.
CH3-CH3 is Ethane, the C-C bond is a single bond.
CH2=CH2 is Ethylene, the C-C bond is a double bond.
CHCH is Ethyne, the C-C bond is a triple bond.
As we know, Bond length and bond strength gets shorter and stronger as the number of bonds between the two atoms increases. Here single bond has the largest bond length and triple has the shortest bond length.
So, in order of C-C bond length (longest to shortest) you have ethane > ethylene > ethyne
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Which two steps are in the wrong order for scientific method? Ask a question, make a hypothesis, test hypothesis, draw conclusions, analyze results, communicate results.
Answer:
draw conclusions and analyze results
the absorbance and fluorescence of a molecule are shown on a spectrum. what can be concluded about the features of the spectrum?
According to the given condition, the
absorbance
is the signal at the highest energy, or longest wavelength. The
fluorescence
is the signal at the lowest energy, or shortest wavelength.
Absorbance is the
logarithm
of the ratio of incident to transmitted radiant power through a sample. It is also known as the measure of the capacity of a substance to absorb light in a specific wavelength.
Fluorescence is the
emission
of light by a substance that has absorbed light or other electromagnetic radiation. Fluorophores are molecules that absorb light in a specific wavelength and emit light in another wavelength.
Absorbance is measured by the principle of
Beer-Lambert's
law. It is also known as Beer's law. It states that the attenuation of light to the properties of the material through which the light is travelling. It is commonly used in chemical analysis and measurements of physical optics for photons and neutrons.
In comparison with absorbance and fluorescence, it is important to consider the specificity of each method. In absorbance, a light of certain wavelength is passed through the solution to measure the optical density or concentration.
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explain why it is not necessary to weigh the flask and the unknown volatile liquid before the initial heating.
As per this case the test tube will be heated so the unwanted gas will be wiped out and only the vapors of our gas will sustain in the flask
what are flasks used for?
There are different types of flasks used in chemistry laboratories they are mainly used for weighing chemicals, preparing stock solutions, preparing reacting solutions and many more.
The test tube will only contain the vapour that is necessary to compute the molar mass because, as you heat this gas, you are producing enough vapour to drive away the air and keep the liquid's vapour present. so that there is no need to weigh the flask before heating the volatile liquid
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during step 2 of the reaction aqueous hydrochloric acid was added dropwise to the solution of the intermediate salt, sodium benzoate. we add hydrochloric acid for different reasons. state these two reasons. what would happen if we skipped this step?
Two reasons for dropwise addition of HCl:
To isolate the organic acid from dilute aqueous base solutionTo maintain the overall pH of the system.What is sodium benzoate?Sodium benzoate, the sodium salt of benzoic acid is widely used as a food preservative and pickling agent. It is a white crystalline chemical with the formula C₆H₅COONa. Although used as a food preservative, it is generally recognized as safe and can be used as an antibacterial agent and flavoring agent in food at a maximum usage of 0.1%. It is also generally recognized as safe (GRAS) when used as a preservative in animal feed.
For the specific case of your question:
Addition of concentrated hydrochloric acid protonates the sodium salt of the organic acid to produce the organic acid. Organic acids are not soluble in aqueous solutions, they precipitate in solution and can be collected by filtration.
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:
A. What is Newton's First Law of Motion?
B. Do objects move by themselves? Why or why not?
Answer:
A:
Newton's First Law of Motion is the law of inertia. It states that an object at rest will remain at rest, and an object in motion will remain in motion, unless acted upon by an unbalanced force.
B:
No, objects do not move by themselves. They require a force to move them.
Explanation:
two absorption peaks located near 255 nm are separated by 0.03 nm. what minimum resolution must a grating have in order to separate these wavelengths?
The minimum resolution to separate these wavelengths is 250nm as they are located near 255n and 0.03nm.
Resolution also known as optical resolution or chiral resolution, or chiral activity refers to the activeness of the compound. It is the process in which two racemic mixtures are separated into its components.
Wavelength is known as the distance between two repeated waves of light. Wavelength is denoted by the symbol lambda (λ). It gives us the idea of the speed or pace of a particular light.
In the given condition, two absorption peaks - absorption spectroscopy is the absorption spectrum between which the light releases protons. Therefore, the wavelength to separate these two absorption peaks is 250nm in minimum.
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An infrared wave has a wavelength of 0.00005 m. What is this wavelength in
scientific notation?
A. 5.0 x 103 m
B. 5.0 x 10-4 m
C. 5.0 x 10-6 m
D. 5.0 x 10-5 m
An infrared wave has a wavelength of 0.00005 m. this wavelength in scientific notation is 5.0 × 10⁻⁵ m.
Scientific notation is also called as standard form. Scientific notation is used to express the number that is too large number or too small is convenient written in a decimal form. scientific notation contains two part decimal number multiply power of 10.
given data is as follows :
infrared wave has wavelength = 0.000005 m
the scientific notation of the wavelength given is = 5.0 × 10⁻⁵ m
Thus, An infrared wave has a wavelength of 0.00005 m. this wavelength in scientific notation is 5.0 × 10⁻⁵.
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what is the temperature of 0.43 mol of xe gas contained in a 2.65 l container at 3.77 atm? question 7 options:
The temperature of 0.43 mol of xe gas contained in a 2.65 l container is 2.79 K.
An ideal gas is a theoretical gas composed of many randomly transferring factor particles that aren't difficult to interparticle interactions. the best gasoline idea is beneficial because it obeys the precise gas law, a simplified equation of country, and is amenable to evaluation under statistical mechanics.
Volume is a degree of occupied three-dimensional space. it's far more frequently quantified numerically the usage of SI-derived gadgets or by way of diverse imperial gadgets. The definition of length is interrelated with the extent.
An ideal gas is described as one for which both the extent of molecules and forces between the molecules are so small that they have got no effect on the behavior of the gas. The real gas that acts almost like a really perfect gasoline is helium. that is due to the fact helium, in contrast to maximum gases, exists as an unmarried atom, which makes the van der Waals dispersion forces as low as viable
Using the ideal gas equation:-
Given;
PV = nRT
T = PV/nR
= 3.77 × 2.65 / 0.43 × 8.314
= 2.79 K
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what mass of silver chloride can be produced from 1.11 l of a 0.156 m solution of silver nitrate? express your answer with the appropriate units.
The mass of silver chloride produced is 24.79g.
Given,
volume = 1.11 L
Molarity = 0.156 M
First, convert molarity to moles by multiplying by the volume:
0.156 M AgNO3 = (0.156 moles AgNO3)/1 L x 1.11 L = 0.173 moles AgNO3
We are only interested in AgCl, not AgNO3. We convert moles of silver nitrate to moles of silver chloride using the balanced equation. This is a 1:1 conversion:
0.173 moles AgNO3 x (1 mole AgCl)/(1 mole AgNO3) = 0.173 moles AgCl
To get mass from moles, we multiply by the molar mass:
0.173 moles AgCl x (143.32 g/mol) = 24.79 g AgCl
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how do the minerals differ from one another how are they alike?
Minerals are similar as they always have a specific chemical structure throughout the entire mineral and are all solids at normal temperatures while they can be different due to their physical properties.
What is a mineral?Minerals are naturally occurring solid substances. They can be made from a single element (like gold) or from a combination of elements (Sodium and Chlorine). The Earth is made up of thousands of different minerals.
Types of MineralsMinerals are often divided into two groups: silicates and non-silicates. Silicates are minerals that contain silicon and oxygen.
The rest of the minerals are classified into a group called non-silicates.
Some important non-silicate minerals include:
Carbonates - Carbonates contain carbonate (CO3) combined with some other element.Halides - Halides contain a halogen element as the main element. Oxides - Oxides are minerals where the main element is oxygen. Sulfides - Sulfides contain sulfur and one or more metals or semi-metals. Other elements such as copper, gold, diamond, graphite, and sulfur can be classified as a third group of minerals.Characteristics of MineralsSolid - All minerals are solids at normal temperatures on Earth.Natural occurrence - Minerals occur in nature. Inorganic - Minerals don't come from plants, animals, or other living organisms.Fixed chemical structure - Specific minerals will always have the same chemical formula and the same combination of elements. Minerals also are generally formed with a crystal structure.In conclusion, minerals are very similar to each other but also differ in their physical properties even if they all exist in the form of crystals.
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1. A sample of a pure substance has a mass of 18 g and a volume of 2 cm) Find the density of
the sample.
What frequency is a wave with a wavelength of 1km?
The frequency of wavelength of 1km 299792.458 Hz.
These molecules already react to the inward motion of the loudspeaker membrane moving toward the source. Frequency and wavelength are inversely proportional to each other. The wave with the greatest frequency has the shortest wavelength. Twice the frequency means one-half the wavelength. For this reason, the wavelength ratio is the inverse of the frequency ratio.
calculation:-
C= wavelength × frequency
frequency = 3 × 10⁸/ 1000 Hz
= 299792.458 Hz.
= 3 ×10⁵ Hz
Based on such a model, we found that mass is not an intrinsic property of the particle. Instead, mass is basically a measure of particle energy. The relations between energy and mass can be directly derived based on the wave properties of the particle. Waves are one of the ways in which energy may be transferred between stores. Waves can be described as oscillations or vibrations about a resting position.
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The frequency of a wavelength of 1km is
299792.458 Hz.
if 27.5 grams of bromine and 12.2 grams of chlorine combine to form bromine monochloride, how many grams of bromine monochloride must form?
According to the given statement 39.45 g many grams of bromine monochloride must form.
How does chlorine help digest food?Last but not least, chloride aids in the creation and release if hydrochloric acid (HCl), which is necessary for the appropriate breakdown and absorption of food in the stomach. Chlorine kills pollutants more quickly but does so for a shorter amount of time since it evaporates more quickly. For a longer time, although more slowly, bromine destroys pollutants;
Briefing:When 27.5 grams of bromine and 12.2 grams of chlorine react, bromine monochloride is produced.
Br2 + Cl2 ---> 2BrCl
mol Br2= 27.5/160g/mol= 0.171mol
mol Cl2= 12.2g/70.906g/mol= 0.172mol
Number of moles of BrCl formed = 2×0.171= 0.342 mol.
mass BrCl= 0.342 mol x 115.357g/mol= 39.45 g
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What chemical reaction has almost the same products and reactants as cellular respiration but reversed?.
Answer: Rusting Photosynthesis
Explanation: Hope this helps
Body fluid is the liquid portion of our cells and tissues. In adults, what is the percentage of our body weight that is water?.
Answer:
50-70%
Explanation:
In adult men, about 60% of their bodies are water. However, fat tissue does not have as much water as lean tissue. In adult women, fat makes up more of the body than in men, so they have about 55% of their bodies are made of water.
describe the relationship between the colors that we see with our eyes and the colors of light that the dye molecules absorb most strongly
The relationship between the colors that we see with our eyes and the colors of light that the dye molecules absorb most strongly is because of its wavelength
When a molecule interact with light and energy is absorbed and the molecule is said to be excited and the transition occurs which take the molecule from an initial state to a higher energy state and if wavelength of light from a certain region of the spectrum are absorbed by a material then the material will appear to be the complementary color and if violet light with wavelength of 400nm is absorbed then the material will look yellow and if the material absorbs blue then the orange color are seen
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what is the main safety hazard of tmscl in this lab, and what precautions should you take when handling tmscl?
The main safety hazards of trimethylsilyl chloride (tmscl) in the lab are,
It could cause severe eye burns.
It is harmful if absorbed through the skin. It could cause severe burns.
It may be harmful if swallowed. Causes severe digestive tract burns.
It may be harmful if inhaled. Causes chemical burns to the respiratory tract.
Prolonged or repeated skin contact may cause dermatitis.
Trimethylsilyl chloride, commonly referred to as chlorotrimethylsilane, is a silyl halide (organosilicon chemical) with the formula (CH3)3SiCl. It is also referred to as Me3SiCl or TMSCl. It is a volatile, colorless liquid that is stable when there is no water present. It has many applications in organic chemistry.
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in a typical heating curve, what is the nature of the slope of the curve when the substrate, in one state of matter, is being heated to another state of matter, but no change of state is occurring? group of answer choices slope < 0 slope
The temperature of a substance does not change while the state does, this shows that the slope has positive gradient. So, the answer is slope > 0.
What is heating curve?The heating curve is the relationship between the flow temperature of the heating system and the outside air temperature.The heat required to change the temperature of a particular substance (without changing phase) is: q = m × c × ΔT. The heat required to produce a particular phase change is given by q = n × ΔH. The slope is actually 1/mc. Continue heating and the solid will melt. During this time the temperature remains constant. The total length of this line is the amount of heat required to melt the solid.To know more about heating curve visit:
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at what temperature would the population of the first excited vibrational state of hcl be 1/e times its population of the ground state?
At 14.52 K, the population of the first energy level is 1/e times that of the ground state.
Temperature and the energy difference between the levels affect the relative population of particles in certain rotating levels. The excitation of particles from one level to another is caused by a rise in temperature.
HCl has a rotational constant (B) of 10.59 cm⁻¹
Identify the ground state's and the first rotational level's energies.
The formula is used to calculate the energy of a rotational level.
E = hcBJ (J + 1)
The rotating level's energy is represented by E (in J).H stands for the Planck constant.The symbol for the speed of light is c.The rotational constant is denoted by B.The level of rotational energy is denoted by J.Following is the calculation of the energy of the ground state (J = 0):
E = hcBJ (J + 1)
E = 6.626 * 10⁻³⁴ J s * 2.998 * 10¹⁰cm s⁻¹ * 10.59 cm⁻¹ * 1 (1 + 1)
E = 4.207 * 10⁻²² J
Using the provided formula, the population of rotational level J in comparison to the ground state is computed.
[tex]\frac{N_{j} }{N_{0} } = 2J + 1 [ \frac{-E_{j} }{_{e}k_{B}T }[/tex] --- (I)
The J-level population is known as [tex]N_{j}[/tex]
N is the ground state's population.
The Boltzmann constant is [tex]k_{B}[/tex]
The temperature is T.
The answer to the query is
N₁ = 1 / e (N₀)
N₁ / N₀ = 1 / e ⇒ (II)
Equate (I) and (II)
1 / e = [2 (1) + 1] [tex][ \frac{-E_{j} }{_{e}k_{B}T }][/tex]
1 / 2.718 = (3) (-4.207 * 10⁻²² J) / (1.381 * 10⁻²³ J K⁻¹ * T)
0.368 = 3 * (-4.207 * 10⁻²² J) / (1.381 * 10⁻²³ J K⁻¹ * T)
0.368 = 3 * e (-30.46 K / T)
Simplifying the above expression:
0.368 = 3 * e (-30.46 K / T)
In 0.368 = In 3 + (-30.46 K / T)
-0.999 = 1.098 - (30.46 K / T)
(-30.46 K / T) = 1.098 + 0.999
Solving for T:
(30.46 K / T) = 1.098 + 0.999
(30.46 K / T) = 2.097
T = 30.46 K / 2.097
Therefore, 14.52 K is the temperature where the first energy level's population is 1/e times that of the ground state.
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COMPLETE QUESTION:
At what temperature would the population of the first rotational level of HCl be 1/e times the population of the ground state? The rotational constant for HCl, B, is equal to 10.59 cm⁻¹
.
which of the following statements is false when performing an ultrasonic scaling during routine dental prophylaxis? a. the ultrasonic scaler should be grasped like a pencil. b. the side of the instrument should be used against the tooth rather than the tip. c. the ultrasonic scaler can be used for supragingival scaling only. d. the ultrasonic scaler should not be on the tooth form longer than 10-15 seconds at a time.
The claim that an ultrasonic scaler can be utilized for both supragingival and subgingival scaling during routine dental prophylaxis is untrue.
What do you mean by dental prophylaxis?During a dental prophylaxis, the teeth are given a thorough cleaning. Prophylaxis is a crucial dental technique for halting the spread of gingivitis and periodontal disease.
Periodontal disease and gingivitis can be brought on by bacteria from plaque that colonize on gingival (gum) tissue above or below the gum line. The body's continuing inflammatory response is brought on by these bacterial colonies' extreme inflammatory reactions and irritation. As the body starts to gradually erode bone and gum tissue, the teeth might shift, become unstable, or even fall out totally. There are more bacteria in the deeper pockets that develop between the gums and teeth.
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What is the empirical formula of a compound containing 60. 0% sulfur and 40. 0% oxygen by mass?.
what is the relationship between the concentration of a solution and the amount of transmitted light through the solution?
Relationship between the concentration of a solution and the amount of transmitted light through the solution is directly proportional to the molar concentration of solution
Concentration is the amount solute that has been dissolved in a given amount of solvent or solution and the percentage of light by the colored solution can be detected and converted to absorbance of light and this is directly proportional and the absorbance is directly proportional to the concentration of the substances and the higher the concentration the higher its absorbance and this is because the proportion of light that get absorbed is affected by the number of molecule that it interact with it
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what term is commonly used to describe foods that are grown with little or no use of synthetic chemicals?
Organic food is the term that is commonly used to describe foods that are grown with little or no use of synthetic chemicals.
How is organic food grown?Organic food is food grown by farmers and farmers according to organic farming practices.Organic farming practices include using organic pesticides, limiting the use of synthetic products, avoiding irradiation, promoting ecological balance and conserving biodiversity.Organic foods have many advantages because they are nutritious, not contaminated with synthetic chemicals such as growth hormones, and not genetically modified.Organic foods include fresh produce, meats, dairy products, and processed foods such as crackers, beverages, and frozen foods.What is organic farming?Organic farming in India is an agricultural process that uses organic fertilizers and pesticides made from animal or vegetable waste. This agriculture began to respond to environmental problems caused by chemical pesticides and synthetic fertilizers. A new agricultural system that restores, maintains and improves the balance of ecosystems.
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chemicals that change behavior or mood by directly affecting activity of the postsynaptic cell are referred to as t
Chemicals that change behavior or mood by directly affecting activity of the postsynaptic cell are referred to as neurotransmitter
In a chemical synapse the postsynaptic membrane is the membrane that receives a signal from the presynaptic cell and respond via depolarization or hyperpolarization and neurotransmitter play an important role in neural communication and they are chemical messengers that carry massages between nerve cell and other cell in your body and influencing everything from mood to involuntary movements and monoamine neurotransmitter such as dopamine are the most important neurotransmitter in the pathophysiology of mood disorders
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Listed in the Item Bank are some important labels for sections of the image below. Match each label to the corresponding area it identifies in the image.
Silicon, Arsenic and Antimony
Can exchange electrons with each other to form ionic compounds
May have no luster
Tin, Calcium and Potassium
Hydrogen, Oxygen and Chlorine
Can be electrical conductors
Comprised of atoms
The corresponding match for each element is as follows:
Silicon, Arsenic, and Antimony - Metalloids
Can exchange electrons with each other to form ionic compounds _ Metals and non-metals
May have no luster - Metalloids and Non-metals
Tin, Calcium, and Potassium - Metals
Hydrogen, Oxygen, and Chlorine - Non-meatals
Can be electrical conductors - Metals and metalloids
Comprised of atoms - all
What are the properties of metals, metalloids and non-metals?The elements can be classified into three;
metalsmetalloids, andnon-metalsEach of these classes of elements has its own unique properties. The properties of the three classes of elements include the following:
Metals - metals are hard and mostly solid substances with luster. They are good conductors of heat and electricity. Metals form ionic compounds with non-metals by exchanging their electrons. Examples are calcium, sodium, copper
Metalloids - they are mostly solid substances that are intermediate conductors of heat and electricity. They may have no luster. Examples are Silicon, Arsenic, and Antimony.
Non-metals - non-metals are soft and mostly gaseous substances with no luster. They are poor conductors of heat and electricity. Non-metals form ionic compounds with metals by exchanging their electrons.
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calculate the theoretical yield of strontium sulfate when 525 ml of 1.199 m sulfuric acid is added to 23.66 grams of strontium bromide
The theoretical yield of strontium sulfate will be 16.47g.
The theoretical yield here can be calculated as:
The grams of sulfuric acid present calculated using formula; molarity = given mass/molar mass/ volume of solution (L)
This will give 61.73 g of sulfuric acid.
In the balanced chemical reaction 1 mole of strontium bromide react with 1 mole of sulfuric acid to give 1 mole of strontium sulfate and 2 moles of hydrobromide. Molar mass of strontium sulfate is 183g/mol and strontium bromide is 246g/mol.
calculating number of moles by using given mass/molar mass; we get
0.09 moles of strontium bromide and 0.63 moles of sulfuric acid.
Thus as 1 mole of strontium sulfate is produced thus: 1*0.09*183 = 16.47g
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