(The reaction of calcium hydride and water produces calcium hydroxide and hydrogen as products). How many moles of H_2(g) will be formed in the reaction between 0.90mol CaH_2(s) and 1.33mol H_2O(l)?

Answer 1

This is a limiting reagent problem How do I know that? Because amounts for BOTH reactants are given.

Write and balance the equation.
Use the coefficients to convert mols of CaH2 to mols H2
Use the coefficients to convert mols H2O to mols H2.
The mols H2 obviously can't be two different numbers; the correct value in limiting reagent problems is AlWAYS the smaller value and the reactant producing that number is the limiting reagent.