alleryStart learning →For (NH4)2SO4 + Ca(OH)2 giving 2NH3 + CaSO4 + 2H2O, how many moles of NH3 come from 4.0 mol of Ca(OH)2?
A2.0 mol
B4.0 mol
C8.0 mol
D16 mol
Answer & Solution
Correct answer: C. 8.0 mol
1. The equation shows 2 mol NH3 for every 1 mol Ca(OH)2.
2. The factor is therefore 2 mol NH3 per 1 mol Ca(OH)2.
3. Multiply: 4.0 mol times 2, which gives 8.0 mol NH3.
4. Halving instead of doubling would give 2.0 mol, which reverses the factor.
5. Multiplying that 8.0 mol by the number of particles per mole gives the molecule count.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 4 "Stoichiometry of Chemical Reactions", section 4.3 Reaction Stoichiometry_
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