Problem with Stoichiometry...?

lol its a bit complicated to explain stoichiometry using the question you posed..... then answer would be 1.86 moles of AlCL3. this is due to the fact that chlorine is the limiting reagent. this can be determined because the normal ratio oe mole of chlorine that react with moles of aluminum are normally 3/2. using that you can find out what the ratio would be if you only had 2.8 moles of chlorine or 4.2 moles of aluminum... if you compare the ratio that they normally react at and compared it to find out how much chlorinde would react with aluminum you would find out that you dont have enought chlorine to react all that aluminum. comparing the moles of chlorine to the original ratio will give you an acceptable an acceptable amount of aluminum. and since the mole ratio of Al to AlCl3 is 2/2 the amont of moles of aluminum that can react with the given amount of chlorine are the same.... hence 2.8 is to 1.86 as 3 is to 2.... if you would like it explained a way you might better understand it give me the best answer on this question and just re ask "how to do stoichiometry.".. :P