A 9.00-mol sample of H2 gas is contained in the left side of the container shown

Question

A 9.00-mol sample of H2 gas is contained in the left side of the container shown below, which has equal volumes on the left and right. The right side is evacuated. When the valve is opened, the gas streams into the right side.

A 9.00-mol sample of H2 gas is contained in the left side of the container shown below, which has equal volumes on the left and right. The right side is evacuated. When the valve is opened, the gas streams into the right side Valve Vacuum (a) What is the entropy change of the gas? JVKE (b) Does the temperature of the gas change? Assume the container is so large that the hydrogen behaves as an ideal gas. O The temperature decreases. O The temperature increases. o The temperature does not change.

Explanation / Answer

Change in entropy is given by:

dS = nR*ln (Vf/Vi)

Using the given values:

Vf = 2*Vi

dS = 9*8.314*ln (2*Vi/Vi)

dS = 9*8.314*ln 2 = 51.86 J/K

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