Methane gas, ch4, effuses through a barrier at a rate of 0.147 ml/minute. if an unknown gas effuses through the same barrier at a rate of 8.87e-2 ml/minute, what is the molar mass of the gas?

1.387 g/mol We set up a proportion using the known values. The molar mass of methane gas is 16.04 g/mol. 16.04 g/mol -- 0.147 ml/minute g/mol -- 8.87e-2 ml/minute 16.04 * 8.87e-2 = 0.20387178447 0.20387178447 / 0.147 = 1.387 The unknown gas has a molar mass of 1.387 g/mol.

Aphysical change is one that you can put in and remove like a ham sandwich. the stuff you put in there can be changem its not permanet. a chemical change is on that can't be change thats permanet. like when you make a cake and bake it. you can't get those ingredients back.