What is the ratio of rates of effusion of gas1 to gas 2? MW gas 1 = 44.05 g/mol and MW gas 2 = 20.22 g/mol

A mixture of 0.239 g of H2, 1.22 g of N2, and 0.837 g of Ar is stored in a closed container at STP. Find the volume (in L) of the container, assuming that the gases exhibit ideal behavior.

A sample of dichloroethane, a dry cleaning solvent, is vaporized into a 266.4 mL flask at 99.8 oC. Some of the sample leaves the flask through a pinhole through the stopper until the pressure in the flask is the same as the outside pressure. A barometer shows the pressure to be 745.3 torr. When the flask is cooled, the mass of dichloroethane in the flask if measured to be 0.8447 g. Calculate the formula weight of dichloroethane. The elemental analysis of dichloroethane is 24.27% C, 4.07% H, and 71.65% Cl.. What is the molecular formula of dichloroethane?

Calculate the number of grams of Mg that reacted to produce hydrogen gas with a volume of 16303 mL collected at 764.77 torr and 21.6˚ C.   Mg (s)          +         2 HCl (aq)            →          H2 (g)           +       MgCl2 (aq) The gas was not collected over water. The ideal gas constant, R = 82.1 atm·mL/mol·K.The ideal gas equation is: PV=nRT