In each of the following cases, determine which reactant is present in excess, and tell how many moles in excess it is.

a. HNO3 +NaOH= NaNO3+ H20; there are 0.90 mol HNO3, 0.85 mol NaOH

b. Ca(HCO3)2 +2 HCL = CaCl2+ 2CO2+ 2H2O; There are 2.5 mol HCl, 1 mol Ca(HCO3)2

Please, show your complete soluyion. Thank you!