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ChemistryChemistry
26 May, 12:44

What is the total number of atoms in the

formula Ca (NO3) 2?

(1) 7 (2) 2 (3) 3 (4) 9

The answer is 9 but I don't understand why, Can someone explain?

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Answers (1)
  1. 26 May, 15:53
    0
    There is one calcium atom. Let's start there.

    NO3 on its own will have 4 atoms; one nitrogen and 3 oxygens (remember, subscripts affect only the atom directly left). Since there are 2 NO3 compounds, there are 8 total atoms in the NO3s (4x2=8). Those 8 plus the calcium atom give you the 9 atoms.
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Home » Chemistry » What is the total number of atoms in the formula Ca (NO3) 2? (1) 7 (2) 2 (3) 3 (4) 9 The answer is 9 but I don't understand why, Can someone explain?
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