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A gas at 350 K and 15 bar has molar volume 20 percent smaller than that for an ideal gas under the same conditions. The correct option about the gas and its compressibility factor (Z) is:

1. Z > 1 and attractive forces are dominant
2. Z > 1 and repulsive forces are dominant
3. Z < 1 and attractive forces are dominant
4. Z < 1 and repulsive forces are dominant

Correct answer: Z < 1 and attractive forces are dominant

Solution

The gas has a molar volume smaller than that of an ideal gas, indicating that attractive forces dominate, causing the gas to compress more. This makes the compressibility factor (Z) less than 1.

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