In a reaction, 25.0 grams of magnesium are added to a beaker containing 75.0 mL of 2.00 M nitric acid, HNO3. Which reactant is limiting? Which is in excess?

Answer 1

How many moles of Mg do you have? (25/23.5 ?)
how many moles of H do you have? (.075*2)

The reaction:
Mg+2HNO3>>H2+Mg(NO3)2
so is the nitric acid moles twice the Mg? If moles Nitric acid is >2*moles Mg, then Mg is limiting.

Answer 2

using the G.U.E.S.S. method, how do I figure out this equation?!!!

Answer 3

You have the equation in the problem.