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Alexus [3.1K]
2 years ago
8

How much heat is released when 0.762 mol of copper cools from 81.6°C to 52.2°C?

Chemistry
1 answer:
andriy [413]2 years ago
8 0

Answer:

548.089  J

Explanation:

-The molar mass of copper is 63.546 grams.

-We obtained the mass of 0.762 moles of copper:

mass =moles\times molar\ mass\\\\\\=0.762\times 63.546\\\\=48.422\ g

-We apply the specific heat formula to calculate the amount of heat released:

q=mC\bigtriangleup T\\\\\\=48.422\ g\times 0.385 \ J/g\textdegree C\times (81.6-52.2)\textdegree  C\\\\\\=548.089  J

Hence, the amount of heat released is 548.089  J

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A fixed amount of gas at 25.0°C occupies a volume of 10.0 L when the pressure is 667 torr. Use Boyle's law to calculate the pres
zaharov [31]

Answer:

The pressure, when the volume is reduced to 7.88L, is 846 torr (option A)

Explanation:

Step 1: Data given

The temperature of a gas = 25.0°C

AT 25 °C the gas occupies a volume of 10.0L and a pressure of 667 torr.

The volume reduces to 7.88 L but the temperature stays constant.

Step 2: Boyle's law

(P1*V1)/T1 = (P2*V2)/T2

 ⇒ Since the temperature stays constant, we can simplify to:

P1*V1 = P2*V2

⇒ with P1 = the initial pressure 667 torr

⇒ with V1 = the initial volume = 10.0 L

⇒ with P2 = the final pressure = TO BE DETERMINED

⇒ with V2 = the final volume = 7.88L

P2 = (P1*V1)/V2

P2 = (667*10.0)/7.88

P2 = 846 torr

The pressure, when the volume is reduced to 7.88L, is 846 torr (option A)

6 0
2 years ago
What is the mass number of an ion with 107 electrons, 159 neutrons, and a +1 charge? express your answer as an integer?
Darya [45]
<span>The mass number of an ion is calculated by adding the neutrons and electrons together. In this case 159+107=266. However, since this ion has a +1 charge, you must add 1 to the electrons. This would give a total mass of 267.</span>
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Carbon dioxide in the oceans is affecting its pH.<br><br> a. True<br> b. False
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<u>larger is the value of </u>Ksp<u> the higher will the solubility of solid in water.</u>

What is called compound?

  • In chemistry, a compound is a substance made up of two or more different chemical elements combined in a fixed ratio.
  • When the elements come together, they react with each other and form chemical bonds that are difficult to break.
  • These bonds form as a result of sharing or exchanging electrons between atoms.

The equation for the dissociation of a solid MX in water is given below

MX(s) ⇄ Mⁿ⁺(aq) + Xⁿ⁻ (aq)

Assume s be the solubility of MX in pure water, then the equilibrium concentrations of ions are

[ Mⁿ⁺] = s

[ Xⁿ⁻ ] = s

The expression for the solubility product constant (Ksp) is as follows

Ksp = [ Mⁿ⁺] [ Xⁿ⁻ ]

       = s²

That is, larger is the value of Ksp the higher will the solubility of solid in water.

Learn more about compound

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