Question

Given the reaction: Ca + 2H20 - Ca(OH)2 + H2 What is the total number of moles of Ca needed to react completely with 6.0 moles of H20?

Answer 1

To determine the number of moles of Ca needed to react completely with 6.0 moles of H20, we can balance the equation:

Ca + 2H2O -> Ca(OH)2 + H2

Since the number of moles of H2O is given (6.0 moles), we can calculate the number of moles of Ca needed to react with this amount of H2O:

6.0 moles H2O / 2 moles H2O/mole Ca = 3.0 moles Ca

So, to react completely with 6.0 moles of H2O, 3.0 moles of Ca are needed.