Problem- a mixture of h2 and nh3 has a volume of 1420cm3 at, Ask an Expert

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Problem- A mixture of H2 and NH3 has a volume of 142.0cm3 at 0.00?C and 1.00 atm. The mixture is cooled to the temperature of liquid nitrogen at which ammonia freezes out and the remaining gas is removed from the vessel. Upon warming the vessel to 0.00?C and 1 atm, the volume is 75.0cm3 . Using the ideal gas law calculate the mole fraction of NH3 in the original mixture.

When I tried to do it I got a fraction of 0.4904 but it said I was incorrect. I only have one more try, please and thankyou for your help!

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