Copper metal reacts with nitric acid according to the following reaction:
___ Cu (s) + ___ HNO3(aq) ==> ___ Cu(NO3)2 (aq) + ___ NO(g) + ___ H2O(l)
a) Balance the equation
b) Determine the grams of H2O (g) produced when 100.0 ml of 75.0% (m/m) HNO3 (density = 1.42 g/ml) reacts with 50.0 g of Cu.