In the equation ca(s) + 2h2o(l) --> ca(oh)2(aq) + h2(g), list each element used as a reactant, and tell how many atoms of each are needed for this reaction.

See below

Explanation:

Ca + 2H2O → Ca(OH)2 + H2

The elements involved are:

The numbers of each atom are:

The 2 in front of H2O multiplies everything in the H2O.

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