During an effusion experiment, a certain number of moles of an unknown gas passed through a tiny hole in 50 seconds. under the same conditions, the same number of moles of oxygen gas passed through the hole in 35 seconds. what is the molar mass of the unknown gas?

3.09 lab: reaction of metals 1 which combinations of substances resulted in a chemical change? for each metal that participated in a chemical change, write the type of metal it is, based on your examination of the periodic table. were there any metallic compounds that did not react with either the acid or the base? write the type of metal, based on your examination of the periodic table. make a general statement about the reactivity of the metals in this experiment.