How many moles of hydrogen atoms are present in 0.150 mol of ammonium sulfate, (NH4)2SO4?
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Correct answer
C. 1.20 mol
Principle or equation
Each formula unit of (NH4)2SO4 contains 8 hydrogen atoms (2 ammonium ions, each with 4 H). Therefore, moles of H atoms = moles of compound × 8.
Why this answer is correct
In (NH4)2SO4, there are 2 NH4+ groups, each containing 4 H atoms, so total H atoms per formula unit = 8. Multiply the given moles of compound by 8: 0.150 mol × 8 = 1.20 mol.
Example
For 0.100 mol of (NH4)2SO4, moles of H = 0.100 × 8 = 0.800 mol.
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