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How many atoms of hydrogen are represented in 2(NH4)2SO4? 4 8 16 32


My first thought was 8, since the subscript multiplies everything in the parentheses. Help?

Verified Answer :

JcAlmighty

The answer is 16.

We have. 2(NH₄)₂SO₄. In NH₄ there are 4 atoms of hydrogen (H). However, in one molecule of (NH₄)₂SO₄, because of subscript 2, there are 2 · 4 = 8 atoms of hydrogen. Further, there are two molecules of (NH₄)₂SO₄ - 2(NH₄)₂SO₄, therefore, there are in total 16 atoms: 2 · 8 = 16

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