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Rudik [331]
3 years ago
12

In terms of molecular motion, why does an increase in pressure lead to an increased solubility of a gas?

Chemistry
1 answer:
postnew [5]3 years ago
7 0
 We imagine a piston cylinder and a solution of gas and water. Molecules are in constant random motion and some of the gas particles are in the vapor phase while some in the liquid phase. At a specific volume, molecules move freely. However, when the piston is moved down, increasing the pressure, some of the molecules in the vapor are pushed down to the liquid phase in order maintain equilibrium thus increasing solubility <span />
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How much heat is required to change 56.0 g of ice (H2O) at 263 K to vapor (steam) at 400 K?
Leona [35]

Heat required = 173 kJ

<h3>Further explanation</h3>

Given

56.0 g of ice

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Required

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Solution

1. raise the temperature(-10 C to 0 C)⇒c ice=2.09 J/g C

\tt Q=56\times 2.09\times (0-(-10)=1170.4~J

2. phase change (ice to water)⇒Heat of fusion water=334 J/g

\tt Q=56\times 334=18704~J

3. raise the temperature(0 C to 100 C)⇒c water= 4.18 J/g C

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4. phase change(water to vapor)⇒heat of vaporization water=2260 J/g

\tt Q=56\times 2260=126560~J

5. raise the temperature(100 C to 127 C)⇒c vapor=2.09 J/g C

\tt Q=56\times 2.09\times (127-100)=3160.08~J

Total heat :

1170.4+18704+23408+126560+3160.08=173,002.48 J=173 kJ

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Answer:

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