okay. i have a test in chemistry tomorrow and ive been studying forever but im really having trouble with some problems on the study guide. for example, one of the problems is 1) consider the reaction Mg(s)+I2(s)---->MgI2(s) Under which of the following reaction conditions will Mg be the limiting reagent? how would i go to do that? i know the answer is a) 200 atoms of Mg and 300 molecules of I2 and B) .16 mol Mg and .25 mol I2 but only because someone told me 2) Consider the reaction 2 SO2 + 02 ---> 2SO3 What is the largest number of SO3 molecules which could be made from 381 SO2 molecules and 185 O2 molecules?