Question:

A gas has a volume of 15 ml at 300 K and 740 mm of Hg. Find the temperature if volume becomes 10 ml at 760 mm pressure of Hg.

Updated On: Jul 28, 2022
  • 205 K
  • 209 K
  • 275 K
  • $ -200\text{ }K $
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The Correct Option is A

Solution and Explanation

: According to gas equation, $ \frac{{{P}_{1}}{{V}_{1}}}{{{T}_{1}}}=\frac{{{P}_{2}}{{V}_{2}}}{{{T}_{2}}} $ or, $ \frac{740\times 15}{300}=\frac{760\times 10}{{{T}_{2}}} $ $ \therefore $ $ {{T}_{2}}=205\,K $
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Concepts Used:

Partial Pressure

Partial Pressure is defined as if a container filled with more than one gas, each gas exerts pressure. The pressure of anyone gas within the container is called its partial pressure.

Dalton’s Law of Partial Pressure:

According to Dalton’s law of partial pressures, the total pressure exerted by the mixture of gases is the sum of the partial pressure of every existing individual gas, and every gas is assumed to be an Ideal gas.

Ptotal = P1 + P2 + P3

Where P1, P2, P3 are the partial pressures of gas 1, gas 2, and gas 3. Since every gas has an independent behavior, the ideal gas law is used to find the pressure of that gas if its number of moles, the volume of container and temperature is known.