Three Chemistry Hon. Questions, anyone?

gabster

New member
Before you read these questions I must say, thank you for aiding me on the other four questions I posted earlier, due to my absense in class on the last week of school <had surgery> I really miss out and have to do this all alone and could not decode this very well even Chem is my toppest subject overall. I managed to do 17/20 of these equations over that past 2 hours except these three I stumbled upon on.

If 35.8 g Mg react with 82.3 g HCl according to the reaction below, how many grams of hydrogen gas will be produced, and how many grams of the excess reactant will be left over? Show your work.
Unbalanced equation: Mg + HCl -> MgCl2 + H2

If 2.0 moles of A and 5.0 moles of B react according to the hypothetical reaction below, how many moles of the excess reactant will be left over at the end of the reaction?

A + 2B -> AB2

0.50 mol A left over

0.50 mol B left over

1.0 mol A left over

1.0 mol B left over

If 63.8 grams of aluminum metal (Al) react with 72.3 grams of sulfur (S) in a synthesis reaction, how many grams of the excess reactant will be left over when the reaction is complete? Show your work.
 
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