0.50 g of Mg reacts with excess oxygen in a
bomb calorimeter with a heat capacity of
3290 J/°C. The initial temperature is 21.5 °C
and the final temperature is 25.2 °C.
What is the enthalpy of the reaction?

Answer:d

Explanation:

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Answer: 1 one is B 2 one is C 3 one is A

The sun, moon, and planets of the solar system are shown with their orbits.

The loops in Ptolemy’s

1 one

A retrograde

B geocentric

C retrograde

model, and those shown on the video, are called

2 one

A heliocentric

B geocentric

C retrograde

motion.

This phenomenon is caused by Earth’s

3 one

A faster

B slower

C larger

orbit than those of other planets.

14036363. 64 kmThe distance apart are the foci of the moon's orbit.

The Moon is Earth's handiest natural satellite tv for pc. it's miles the fifth largest satellite within the solar gadget and the biggest and big relative to its parent planet, with a diameter about one zone that of Earth.

The foci of the moon's orbit  = 772,000 km/ 0.055

                                             = 14036363. 64 km.

The Moon takes approximately one month to orbit Earth (27. three days to finish a revolution, but 29.5 days to alternate from New Moon to New Moon). because the Moon completes each 27. three-day orbit around Earth, each Earth, and the Moon are transferring across the solar.

The Moon orbits Earth inside the same course as our planet rotates. So, the Moon clearly acts from west to east through our sky, albeit so slowly that we almost by no means note it.

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The number of moles in 0.620 L of a 2.6M KCl solution is 1.61 moles.

Molarity is the concentration of a substance in solution, expressed as the number of moles of solute per litre of solution.

The molarity of a solution can be calculated by dividing the number of moles of the substance by its volume as follows:

no of moles = molarity × volume

According to this question, 0.620 L of a KCl solution has a molarity of 2.6 M. The number of moles of the substance is as follows:

no of moles = 2.6M × 0.620L = 1.612moles

Therefore, 1.61 moles is the number of moles in the pottasium chloride solution.

The incomplete question is as follows:

Determine the number of moles contained in 0.620L of a 2.6 M KCl solution.

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A = 2.86 x [tex]10^{23[/tex] molecules of  [tex]KMnO_4[/tex]

B = 323.76 grams of Al

C = 1.53 moles of Au

D = 7.71 x [tex]10^{23[/tex] molecules of [tex]H_3PO_4[/tex]

E = 4.52 x [tex]10^{23[/tex] total atoms

According to Avogadro, a single mole of any substance contains 6.022 x [tex]10^{23[/tex] molecules or atoms of the substance.

Also, the mole of a substance is the ratio of the mass of the substance and the molar mass of the substance. In other words;

mole = mass/molar mass

These theories are what we need to solve the outlined problems.

       Mole of 75 g of [tex]KMnO_4[/tex]:

       mass/molar mass = 75/158

                                     = 0.4747 mol

        Since 1 mole = 6.022 x [tex]10^{23[/tex] molecules

         0.4747 mole = 0.4747 x 6.022 x [tex]10^{23[/tex]

                                = 2.86 x [tex]10^{23[/tex] molecules

       Since 1 mole =  6.022 x [tex]10^{23[/tex] molecules or atoms

        7.23 x [tex]10^{24[/tex] atoms = 7.23 x [tex]10^{24[/tex] / 6.022 x [tex]10^{23[/tex]

                                     = 12 moles

        Mass of 12 moles Al = 12 x 26.98

                                          =  323.76 grams    

                                    = 1.53 moles

                                   = 1.28 moles

         1.28 moles = 1.28 x 6.022 x [tex]10^{23[/tex]

                            = 7.71 x [tex]10^{23[/tex] molecules

                                        = 4.52 x [tex]10^{23[/tex] atoms

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Examples of buffer solutions include:

Some applications of buffer solutions in Pharmaceutical Sciences include:

A buffer solution is an aqueous solution consisting of a mixture of a weak acid and its conjugate base, or vice versa.

Buffers are broadly divided into two types

1. acidic buffer solutions and

2. alkaline buffer solutions.

Acidic buffers are solutions that have a pH below 7 and contain a weak acid.

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Answer:

Hope It Helps You

Explanation:

Acetic anhydride is a colorless liquid with a characteristic pungent odor. It is used in the manufacture of plastics, drugs, dyes, perfumes, explosives, and aspirin.

This chemical compound has a colorless liquid appearance, also called anhydride, acetic, smells like vinegar.

The initial temperature of copper is 89.41°C.

Calorimetry is the science of measuring the heat absorbed or evolved during the course of a chemical reaction or change of state.

According to this question, a 98.3 g piece of copper with specific heat of 0.380 J/g･°C is heated and then placed into 400.0 g of water initially at 20.7°C. The water increases in temperature to 22.2°C. The initial temperature can be calculated as follows;

Q = mc∆T

Where;

Q(water) = -Q(metal)

400 × 4.184 × 1.5 = -(98.3 × 0.38 × {22.2 - x})

2510.4 = - (829.26 - 37.354x)

2510.4 = -829.26 + 37.354x

3339.659 = 37.354x

X = 89.41°C

Therefore, 89.41°C is the initial temperature of the copper metal.

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The initial temperature of the copper piece is approximately 0.72°C.

To find the initial temperature of the copper piece, we can use the equation Q = mcΔT, where Q is the heat energy, m is the mass of the substance, c is the specific heat capacity, and ΔT is the change in temperature.

First, let's calculate the heat energy gained by the water. The mass of the water is 400.0 g, and the change in temperature is 22.2°C - 20.7°C = 1.5°C.

Using the equation Q = mcΔT, we have:

Q_water = (400.0 g)(4.18 J/g • °C)(1.5°C) = 2490 J

Next, let's calculate the heat energy lost by the copper piece. The mass of the copper is 90.7 g, and the change in temperature is the same as the water, 1.5°C.

Using the equation Q = mcΔT, we have:

Q_copper = (90.7 g)(0.380 J/g • °C)(1.5°C) = 51.8 J

Since energy is conserved, the heat energy gained by the water is equal to the heat energy lost by the copper piece:

Q_water = Q_copper

2490 J = 51.8 J

Now, let's solve for the initial temperature of the copper piece. Rearranging the equation Q = mcΔT to solve for the initial temperature, we have:

T_initial = (Q_copper) / (m_copper * c_copper)

Substituting the values, we get:

T_initial = (51.8 J) / (90.7 g * 0.380 J/g • °C) ≈ 0.72°C

Therefore, the initial temperature of the copper piece is approximately 0.72°C.

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The mole is an SI unit that links the microscopic and macroscopic world that is why yes, mole is the base of SI unit.

What is a mole?

A mole is a popular scientific measurement unit for large quantities of very small items like atoms, molecules, or other specified particles in chemistry. It can also be spelt mol.

A extremely big amount, 6.02214076 1023 units, are designated by the mole. As of May 20, 2019, the General Conference on Weights and Measures defined the mole as this quantity for the International System of Units (SI). The mole was traditionally defined as the number of atoms found by experimentation to be present in 12 grammes of carbon-12.

The quantity of units in a mole is also referred to as Avogadro's number or Avogadro's constant in honour of the Italian physicist Amedeo Avogadro. Equal volumes of gases under the same conditions, according to Avogadro.

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Answer:

Br- has 35 protons and 36 electrons

Explanation:

Do you mean Br-?

Br has atomic number of 35 => 35 protons.

Neutral Br has 35 electrons.

Br- has 1 extra electron, resulting in total of 36 electrons.

A chemist must take 6.053 mL of 3.6 M NaOH in water to form 16.61 mL of 1.312 M NaOH solution.

In the laboratory, high-concentration solutions are prepared for using a longer duration. This solution is known as a stock solution. These solutions are diluted based on chemical needs.                                               We need 6.61 mL of 1.312 M NaOH solution                                                                                The stock concentration of NaOH solution = 3.6 M                                                  We have to find the volume of this stock solution that should be taken Given M₁ = 3.6 M M₂ = 1.312 M V₂ = 16.61 mL V₁ =?

M₁V₁ =M₂V₂

3.6 × V₁ = 1.312 × 16.61

V₁ = 1.312 × 16.61 ÷ 3.6

V₁ = 6.053 mL

Hence, 6.053 mL of 3.6 M NaOH is needed to form 16.61 mL of 1.312 M NaOH solution

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The concentration of the solution is obtained as 0.08 M.

We know that the reaction that occurs between the sodium hydroxide and the hydrochloric acid is one that may be referred to as neutralization reaction. We can see that the reaction is given by; [tex]NaOH(aq) + HCl(aq) --- > NaCl(aq) +H_{2} O(l)[/tex]

Thus;

Concentration of the acid CA =  0.200 M

Volume of the acid VA = 10.00 mL

Volume of the base VB = 25.05 mL

Concentration of the base CB = ??

Number of moles of the acid NA = 1

Number of moles of the base NB = 1

Then;

CAVA/CBVB = NA/NB

CAVANB = CBVBNA

CB= CAVANB/VBNA

CB = 0.200 M *  10.00 mL * 1/ 25.05 mL * 1

= 0.08 M

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The energy from the photons in the FM station is greater than that from the AM station.

We have to recall that the radio waves are also a part of the electromagnetic spectrum and that the speed that is possessed by all of the waves waves that are in the electromagnetic spectrum is the speed of light (3 * 10^8 m/s).

We have;

E = hf

E = energy

h = Plank's constant

f = frequency

For the AM station;

E = 6.6 * 10^-34 Js * 1030 * 10^3 Hz

E = 6.798 * 10^-28 J

For the FM station;

E = 6.6 * 10^-34 Js * 98.4 * 10^6 Hz

= 6.494 * 10^-25 J

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Missing parts;

An AM radio station broadcasts at 1030 kHz , and its FM partner broadcasts at 98.5 MHz .

partA;Calculate the energy of the photons emitted by the AM radio station.

partB;Calculate the energy of the photons emitted by the FM radio station.

partC;Compare the energy of the photons emitted by the AM radio station with the energy of the photons emitted by the FM radio station.

The molecules in which the central atom has an expanded octet is BrF₃ ans SF₆.

Hypervalent compound is the compound in which central atom contains more than 8 electrons or expanded octet.  Hypovalent is the compound in which atom posses less than eighth electron in the valence shell. in  In  BrF₃ , Bromine has 7 valence electron and fluorine seven electrons . the three F atom complete their octet after the bonding with Br but In Br there are 10 electrons in valence shell . so,  BrF₃ has expanded octet. SF₆, the sulfur , sulfur has 6 valence electron and Fluorine has 7 valence electron F atom complete there octet with sulphur but S atom has 12 valence electrons that is expanded octet.

Thus, The molecules in which the central atom has an expanded octet is BrF₃ ans SF₆.

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Mass of 7.64 x 10^25 molecules of l₂ is 3.04 grams

Calculation of mass here we are doing from the number of molecules given. To do so we use the Avogadro's number. Avogadro's number is one of the most  fundamental constants of chemistry. It helps us to compare the different atoms or molecules of given substances where the same number of atoms or molecules are being compared.

Along with that we will also be using the number mole as well here. number of moles is nothing but the given mass divided by the molecular mass of the compound.

To solve the above given question we use the below given formulas;

number of molecules = Number of moles × Avogadro number

Number of moles = Number of molecules

                                  Avogadro number

⇒ 7.64×[tex]10^{25}[/tex]    = 0.012 moles

   6.023×[tex]10^{23}[/tex]

Mass = Number of moles × Molecular mass

⇒ 0.012 × 253.80 = 3.045 grams

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The molarity of the stock Mn²⁺ ions is 0.0288 M

Based on the dilution formula;

The molarity of a solution is the number of moles of a solute dissolved in a given volume of solution in liters.

The molarity of the stock solution is:

moles of Mn²⁺ ions = mass / molar mass

molar mass of  Mn²⁺ ions = 55.0 g/mol

moles of Mn²⁺ ions = 1.584 / 55

moles of Mn²⁺ ions = 0.0288 moles

molarity of Mn²⁺ ions = 0.0288 / 1

molarity of Mn²⁺ ions = 0.0288 M

The dilution formula is used to determine the molarities of A, B, and C.

C₁V₁ = C₂V₂

C₂ = C₁V₁ / V₂

Where;

Molarity of A = 50 * 0.0288 / 1000

Molarity of A = 0.00144 M

Molarity of B = 10 * 0.00144 / 250

Molarity of B = 0.0000576 M

Molarity of C = 10 * 0.0000576 / 500

Molarity of C = 0.000001152 M

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Answer: the balanced equation is the same.

Explanation:

Every element must have the same number of atoms on each side of the equation (law of conservation of mass).

2. Balancing the equation can be done only by adjusting the coefficients.

C

is a balanced element because there is the same number of atoms of

C

in each side of the equation.

C

is a balanced element

H

is a balanced element because there is the same number of atoms of

H

in each side of the equation.

H

is a balanced element

O

is a balanced element because there is the same number of atoms of

O

in each side of the equation. O is a balanced element. Na is a balanced element because there is the same number of atoms of Na on each side of the equation. Na is a balanced element H is a balanced element because there is the same number of atoms of H on each side of the equation. H is a balanced element C is a balanced element because there is the same number of atoms on each side of the equation. C is a balanced element. O

is a balanced element because there is the same number of atoms of

O in each side of the equation. O is a balanced element. All elements have the same number of atoms on each side of the equation, which means that the law of conservation of mass is satisfied and thus the chemical equation is balanced.

The intermolecular forces between the oxygen molecules are very weak because of which a very less amount of energy is required for the oxygen to evaporate into a gas. There is no H-bonding or dipole movement present in oxygen molecules because of which the forces binding the molecules are absent in oxygen.

hence your correct option should be D

The mass of the solute required is 250.25 g.

We know that the number of moles of the solute can be used to obtain the mass of the solute that is  required. We can now try to find the mass of the solute that is required.

Concentration of the solution = 0.350M

Volume of the solution = 6.5 L

Number of moles of the solute = 0.350M *  6.5 L

= 2.275 moles

We now have the mass of the solute as;

2.275 moles  * 110 g/mol

= 250.25 g

Th measured mass of the solute that we would have to use is 250.25 g.

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Missing parts;

A chemist wants to make 6.5 L of a .350M CaCl2 solution. What mass of CaCl2(in g) should the chemist use?

To calculate the new volume of a gas, we must first understand the atm.

What is atm?

oceanic atmospheric pressure At sea level, it has a mean value of about and is defined as the pressure created by the weight of the atmosphere. Sometimes, this figure is used as a standard pressure or a reference pressure. The unit of pressure is atm.

What does one atmosphere of pressure equal?

760 cm of mercury is equal to one atmosphere of pressure at sea level.

Using the atm formula,

P1 V1/T1 = P2 V2/T2

15×28/500= 18×V2/500

15×28×400/500×18 = V2

V2=29.166

V2=29.17 L

Therefore the option (B) is correct.

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hope this helps you out I would have typed an answer using my notes but that was taking to long anyways have a nice day

5.57  is the pH of the buffer .

What is buffer ?

Buffer, in chemistry, usually a solution containing acids and bases or salts that tends to maintain a constant concentration of hydrogen ions. An ion is an atom or molecule that has lost or gained one or more electrons. A common buffer is a solution of acetic acid (CH3COOH) and sodium acetate. In aqueous solution, sodium acetate completely dissociates into sodium (Na+) and acetate (CH3COO-) ions. Buffer solutions with different hydrogen ion concentrations can be prepared by varying the buffer ratio and choosing acids of appropriate intrinsic strength. Commonly used buffers include phosphate, citrate, or borate and their salts

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Answer:

18g

Explanation:

1g H + 8g O = 9g H2O since H is limiting factor

The molarity of the 724.4g of ammonium phosphate in 4500 mL of alcohol is 1.0804m.

Ammonium  phosphate [tex]$\Rightarrow\left(\mathrm{NH}_4\right)_3 \mathrm{PO}_4$[/tex]

GMM of Ammonium Phosphate [tex]$\Rightarrow 109 \mathrm{~g}+40 \mathrm{~g}$[/tex] [tex]$\Rightarrow 149 \mathrm{~g}$[/tex]

No. of moles of Ammonium Phosphate [tex]$\Rightarrow\left\{\frac{724.4}{149}\right\} \Rightarrow 4.8$[/tex]

Molarity = 4.86/4.5 = 1.0804m.

Phosphates are low in toxicity, however they create nutrient contamination and nourish algae. Eutrophication and hazardous algal blooms result as a result of this. Many countries, notably the European Union and the United States, have outlawed the use of phosphates in detergent.

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Triple beam balance is not used to measure the weight of water because it is used to  measure mass.

The triple beam balance is an instrument used to measure mass very precisely. Such devices typically have a reading error of ±0.05 grams. Its name refers to its three beams, where the middle beam is the largest, the far beam of medium size, and the front beam the smallest.

Spring balance is used to measure the weight of the body whereas beam balance is used to measure the mass of the body. Since the mass of the body remains the same on earth as well as on moon but the acceleration due to gravity differs.

Therefore Triple beam balance is not used to measure the weight of the water.

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Chlorine gas is bubbled through a calcium bromide solution is a single displacement reaction.

Chlorine (in the form of a gas or dissolved in water) replaces bromine when added to calcium bromide solution. Chlorine replaces bromine in calcium bromide because it is more reactive than bromine. The solution darkens. The displaced bromine is responsible for this brown color. calcium chloride is the product of the chlorine.

A single replacement reaction, also known as a single displacement reaction, occurs when one element in a molecule is swapped out for another. Starting ingredients are always pure elements combined with an aqueous compound, such as pure hydrogen gas or zinc metal. A new aqueous compound and a different pure element will be produced as products when a replacement reaction takes place.

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The IUPAC name and molecular formula for the following are,

a) prop-1-yne, C3H4

b) non-4-yne, C9H16

c) hex-3-yne, C6H10

What is IUPAC name?

International Unit for Pure and Applied Chemistry (IUPAC) is the method of naming the organic compounds in chemistry. It creates a standardized naming for the chemical compounds. There are prefixes, suffixes and parent chain considered while naming a compound.

The IUPAC name can be written by counting the parent chain carbons and considering the functional group present which is a triple bond in the given compounds. The molecular formula can be written by counting the number of different atoms present in the compound.

Therefore, the IUPAC name and molecular formula of the given compounds can be written as,

a) prop-1-yne, C3H4

b) non-4-yne, C9H16

c) hex-3-yne, C6H10

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Early "chemists" focused on practical problems - the production of dyes and perfumes, the production of soap, the use of metals, the production of glass, etc. The goal was not to make sense of the physical world.

Tapputi (also known as Tapputi-Belatekallim, referring to the female attendants of the palace), believed to be the world's first recorded chemist and perfume maker, mentioned in a cuneiform tablet from Babylonian Mesopotamia, circa 1200 BC It is BC is mentioned.

Along with Lavoisier, Boyle, and Dalton, Berzelius is considered the father of modern chemistry. In 1828, using oxygen as a standard and fixing its weight at 100, he produced a table of relative atomic weights containing all the elements known at the time.

Very early chemists were often motivated primarily by achieving a particular goal or product. It didn't take a lot of theory to make perfume or soap, just a good recipe, and attention to detail. There was no standard way to name substances (and no periodic table we could all agree on).

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