answer and show work please

Question

What mass of water is needed to completely react with 2.35g of Ca?

Answer 1

Write the correctly balanced equation for the reaction taking place:

Ca + 2H₂O ==> Ca(OH)₂ + H₂

moles Ca present = 2.35 g Ca x 1 mol Ca / 40.08 g = 0.05863 moles Ca

moles H₂O needed = 0.05863 mols Ca x 2 mols H₂O / mol Ca x 18 g H₂O/mol H2O = 2.11 g H₂O