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2017 O Level Chem P1 Q10 — Stoichiometry / Mole Calculations Solution

Stoichiometry / Mole Calculations 2017 O Level Pure Chemistry · Paper 1 · Q10

Question

The equations show the reactions involved in the formation of nitric acid, HNO₃, from nitrogen. N₂ + O₂ → 2NO 2NO + O₂ → 2NO₂ 4NO₂ + 2H₂O + O₂ → 4HNO₃ How many moles of nitric acid are formed from 0.50 moles of nitrogen?

A0.25
B0.50
C1.00
D4.00

Correct answer: C

Video Solution

Explanation

Answer: C. Nitrogen atoms are conserved through the three equations: every nitrogen atom ends up in one molecule of \(\text{HNO}_3\).

0.50 mol of \(\text{N}_2\) contains 1.0 mol of nitrogen atoms, which form 1.0 mol of \(\text{HNO}_3\).

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