Is general gas law similar with combined gas law?

Daltons law with the combined gas law - over water?

  • Hi! I'm doing a review assignment and forgot how to do this. Please don't just give me the answer, please walk me through the steps. Thanks! 1632.0 cm^3 of hydrogen gas is collected over water at a pressure of 162.4 kPa and 70.0 degrees C. What is the volume of the dry gas at 129.4 kPa and 45.0 degrees C? The vapor pressure of water at 70.0 degrees C is 31.2 kPa.

  • Answer:

    162.4 kPa minus 31.2 kPa = 131.2 kPa (that's the pressure of the dry gas when at 70 C) P1V1 / T1 = P2V2 / T2 [(131.2 kPa) (1632.0 cm^3)] / 343 K = [(129.4 kPa) (x)] / 318 K solve for x

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