In chemistry, a mole is a measuring unit of atoms, molecules, ions etc. The number of moles of calcium oxide in the sample is 0.0499 moles.
What is a mole?A mole is a ratio of mass and the molar mass of the substance. It can measure the small number of molecules, atoms, ions etc. present in the compound.
Given,
Mass of calcium oxide = 2.80 g
Molar mass = 56.08 g/mol
Moles can be calculated as:
[tex]\begin{aligned}\rm moles &= \rm \dfrac{mass}{\rm molar \; mass}\\\\&= \dfrac{2.80}{56.08}\\\\&= 0.0499\;\rm mol\end{aligned}[/tex]
Therefore, option A. 0.0499 mol is the moles of the calcium oxide.
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Answer: 0.0499
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explain the three laws of chemical reaction in detain gilling examples
Answer:
The three laws of Chemical Reaction are .The law of constant proportions. The law of multiple proportions. The law of reciprocal proportions.
A chemical compound is always found to be made up of the same elements combined together in the same fixed proportion by mass.
potassium and chlorine gas ---> chloride.
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2.37 x 10-7
is
1 x 10-7,
greater than
less than
Answer:
greater than
Explanation:
If fluorine is stronger than carbon, what charge will the fluorine receive?
a. partially negative
b. partially positive
c. positive
d. negative
explain why
If fluorine is stronger than carbon, fluorine will receive a negative charge.
WHAT IS THE ELECTRONEGATIVITY SERIES?The electronegativity series is the order in which elements of the periodic table are ranked in terms of their negative charges.
Elements with higher electron affinity are positioned higher in the series. According to this question, fluorine is stronger than carbon.
This means that fluorine will receive a negative charge (-) to become more electronegative.
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How to answer part A?
Answer:
H2C3H2O4 + 2KOH → K2C3H2O4 + 2H2O
1. Differentiate Physical and chemical changes of matter?
what is the volume of 5 moles of oxygen gas at r.t.p
Write a few sentences about respiration in your own words please just explain what is respiration and don’t answer for points because I will report you!!! For the longest while I’m trying to get a answer to this question
Answer:
The inhaling of oxygen and the exhaling of carbon dioxide. The process by which cells use oxygen to break down sugar and obtain energy is called respiration.
deacribe strata! as short of an answer as possible please and help asap for brainliest
Answer:
sedimentary rock layer bounded by two stratification planes
How much iodine should you take if exposed to radiation.
Answer:
12-18 65mg or sometimes 130mg if its just one or 1/2 a tablet
Explanation:
When the nonelectrolyte glucose is dissolved in water, the solution contains ________.
a. all glucose molecules
b. all glucose ions
c. nothing
d. mostly glucose molecules and a few ions
e. only OH- ions
Find the liters of 1.112 moles of CO
Answer:
24.9
Explanation:
Answer:
should be 22.4L
Explanation:
Help!!!
An unknown salt was dissolved to make a total 1.53g of solution. The temperature of the water decreased from
24.3C to 20.3C when 8mol were dissolved. What is the heat of solution in J/mol?
Answer:
3.213J/mol
Explanation:
first specific heat capacity of water = 4200J/Kg K
Q=mass×temperature difference×specific heat capacity
Q=1.53×(24.3-20)×4200
Q=25.704 J
heat of solution= quantity of heat ÷ amount of substance
heat of solution= 25.704÷8
heat of solution= 3.213J/mol
What is one way to move carbon from fossil fuels into the atmosphere?.
Explain what is respiration in your own words..
Answer:
Plants using glucose to make ATP molecules during the process of photosynthesis which results in the plant releasing oxygen.
This is cellular respiration. ↑
2. In the reaction below, which substances are considered reactants?
C2H60
+
O2
CO2
+
H2O
which of these are considered reactants
Answer:
see below
Explanation:
All of them are considered reactants because a reactant is a a substance that takes part in and undergoes change during a reaction.
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Identify three characteristics that will be passed down to the offspring of this apple tree.
its a write your answer
Answer:
eyes hair skin
Explanation:
eyes you can get from parents skin and hair
What is the correct practice for minimizing exposure during a hazardous chemical spill?.
[tex]Important[/tex] [tex]Procedures[/tex]
▬▬▬▬▬▬▬▬▬
Wear these items...
GlovesGogglesLab coat∴ Hope this helps! Please give thanks. ∴
To prevent inhaling spill vapors. Avoid attempting to clean up a spill if it is in an area that isn't well-ventilated. Send out a call for help to respond to and clean up the spill.
Additionally, more severe side effects include breathing problems, coughing, wheezing, a faint feeling, or weakness that may result from significant chemical exposure. The most dangerous substances can cause immediate collapse, convulsions, and possibly even death.
Wearing personal protection equipment (often known as "PPE") helps reduce exposure to a number of risks. Gloves, foot, and eye protection, protected hearing equipment (earplugs, muffs), hard helmets, respirators, and complete body suits are a few examples of PPE.
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The combustion of c2h4(g) is represented by the equation above. (a) use the enthalpies of formation in the table below to calculate the value of δh∘1 for the reaction
Based on Hess law of constant heat summation, the enthalpy of the combustion of C2H4 can be calculated from the heat of formation values of the products CO2 and H2O.
What is a combustion reaction?A combustion reaction is a reaction between a substance and oxygen in which light and large amounts of heat is given off.
The amount of heat evolved when one mole of that substance reacts completely with oxygen is known as the enthalpy of combustion of that substance.
The equation of the combustion of C2H4 is given below:
C2H4 + 3 O2 ---> 2 CO2 + 2H2OThe enthalpy of the combustion of C2H4 can be calculated from the heat of formation of the products CO2 and H2O based on Hess law.
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You want to spread honey on your toast, but it is too thick to spread. What term from today's lesson describes the "thickness" of the honey? How could you change the "thickness" of the honey?
Answer:
Since I was not present in your lesson, I can only guess your vocabulary words. I am guessing consistency though.
What is Delta.Hrxn for the overall reaction?
kJ
Answer:
The enthalpy change of the reaction comes out to be -890 Kj Explanation:To calculate the enthalpy of the reaction divided in multiple steps, we use Hess's law. This law states that the heat absorbed or evolved in a given chemical equation remains same whether the process occurs in one step or several steps.To apply this law, the enthalpy of the chemical equation is treated as ordinary algebraic expression and it can be added or subtracted to form the required equation. This means that the enthalpy change of the overall reaction is equal to the sum of the enthalpy changes that occur during intermediate reactions.
Explanation:
Answer:
A few definitions:
1. A river delta is a land-form created by deposition of sediment that is carried by a river as the flow leaves its mouth and enters slower-moving or stagnant water. This occurs where a river enters an ocean, sea, estuary, lake, reservoir, or another river that cannot carry away the supplied sediment.
2. The fourth letter of the Greek alphabet ( Δ, δ ), transliterated as ‘d’.
3. a code word representing the letter D, used in radio communication, mostly in the military
4. variation of a variable or function.
5. a finite increment.
This is not a plagiarized passage this is my knowledge and research.
How many moles are in 182 grams of BC13?
Answer:
?
Explanation:
In an aqueous solution which substance yields hydrogen ions as the only positive ion *
Answer:
CH3COOH
Explanation:
Can someone please help me? :(
Answer:
C D
Explanation:
NOAA airplanes continuously transmit measurements of pressure, humidity, temperature, and wind direction and speed as they fall toward the sea, providing a detailed look at the structure of the storm and its intensity.
Which statement accurately describes differences between RNA and DNA?
Group of answer choices
RNA contains the nitrogenous base thymine, while DNA contains the nitrogenous base uracil.
RNA always folds into a single helix while DNA always folds into a double helix.
RNA contains pyrimidine bases, while DNA contains purine bases.
The nucleotides in DNA contain one phosphate group while those in RNA contain two phosphate groups.
The sugar in DNA contains one less hydroxyl group than the sugar in RNA.
Answer:
RNA always folds into a single helix while DNA always folds into a double helix.
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What is potential energy?
A. stored energy
B. the energy of motion
C. the energy of light
D. the energy at the bottom of a roller coaster
Answer:
A. stored energy
Explanation:
potential energy is stored energy.
kinetic energy is the energy of motion
In areas without excessive light pollution, a band of light can be seen spanning the night sky. This band of light comes from OA. Stars at the edge of the universe. OB. Planets in the solar system. Ос. Moons in the solar system. OD. Stars in the Milky Way.
Answer:
In areas without excessive light pollution, a band of light can be seen spanning the night sky ... - did not match any news results.
Suggestions:
Explanation:
Answer:
stars in the milky way
Explanation:
The band of light that can be seen spanning the night sky comes from stars in the Milky Way Galaxy. The Milky Way Galaxy is a spiral galaxy that contains hundreds of billions of stars.
Is it possible to modify the gases in our atmosphere?
Answer:
Yes, but it would a tremendous amount of time to do so
Explanation:
You could just spray a ton of hydrogen in the atmosphere and turn the oxygen to water
9.0 x 10^23 molecules of CCI4 dissolved to make 500 mL of solution. Find molarity
Answer: 1.34 M
Explanation:
What behavior of sound waves causes echoes? A. absorption B. reflection C. refraction D. transmission
what is chemical change? what are some ways to tell chemical change happened?
Answer:
A chemical change occurs when the reactants chemical compositions have changed
Explanation:
a change in colour, change in temperature, change in smell, formation of a precipitate, or the formation of gas bubbles
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