Which is the formula mass of open paren NH sub 4 close paren sub 2 SO sub 4 ?

In (NH₄)₂SO₄, the subscripts give 2 nitrogen atoms, 8 hydrogen atoms, 1 sulfur atom, and 4 oxygen atoms. Add their atomic masses: 2(14.01) + 8(1.008) + 32.06 + 4(16.00) = 132.14 amu, which rounds to about 132.1 amu. The correct choice is 132.17 amu.

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