Average Molecular Mass -- Composition of a Gaseous Mixture?

Question

Chlorodifluoromethane (CHF2Cl) was widely used in the compression/cooling circuits of refrigeration or air-conditioning systems. Since the discovery that such compounds (HCFCs and CFC's) released into the atmosphere were a major cause of depletion of stratospheric ozone, newer refrigeration systems make use of certain hydrofluorocarbons (HFCs), which are degraded in the lower atmosphere, instead. Often, mixtures of such compounds are used.

Suppose a sample of refrigerant gas consisting of a simple mixture of the gases pentafluoroethane (C2HF5) and 111-trifluoroethane (C2H3F3) has a density of 2.27 g/L at 19 °C and 0.497 atm.


Calculate the average molecular mass for this sample.
________ amu

Calculate the volume percentage of C2H3F3 in the sample.
________%

Answer 1

32