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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.

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Answer:

See below

Explanation:

Ca + 2H2O → Ca(OH)2 + H2

The elements involved are:

  • Ca — calcium
  • H   —   hydrogen
  • O   — oxygen

The numbers of each atom are:

  • 1  atom  Ca
  • 4 atoms H
  • 2 atoms O

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

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