Mg + 2HCl -> MgCl2 + H2
If 5 moles of HCl are used, how many moles of MgCl2 can be made?
According to the given balanced chemical equation, the stoichiometric ratio between HCl and MgCl2 is 2:1. This means that for every 2 moles of HCl, 1 mole of MgCl2 is produced.
Since there are 5 moles of HCl used, we divide it by 2 to determine the number of moles of MgCl2 that can be made:
5 moles HCl / 2 = 2.5 moles MgCl2.
Therefore, 2.5 moles of MgCl2 can be made when 5 moles of HCl are used.