2.0 moles of H2O vapor at 0.20 atm and 298K are allowed to expand so that volume doubles. The temperature is unchanged. What is the new pressure (in atm)?
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Correct Answer: B. 0.1
Use P1V1 = P2V2. Temperature is constant and can be eliminated from the equation. If the volume increases, we know the pressure must decrease. Doubling the volume should then halve the pressure.
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