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The chemical formula of ammonium sulfide is (NH4)2S.

In each molecule of ammonium sulfide there are 2(4)=8 hydrogen atoms.

And 1 mol of ammonium sulfide contains 6.02 x 1023 molecules (avogadro constant).

Therefore, number of H atoms

= 8 x 3.90 x 6.02 x 1023

= 1.88 x 1025

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Q: How many hydrogen atoms are in 3.90 mol of ammonium sulfide?
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