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Date November 2014 Marks available 1 Reference code 14N.1.sl.TZ0.2
Level SL Paper 1 Time zone TZ0
Command term Question number 2 Adapted from N/A

Question

When sodium bromate(V), \({\text{NaBr}}{{\text{O}}_{\text{3}}}\), is heated, it reacts according to the equation below.

\[{\text{2NaBr}}{{\text{O}}_{\text{3}}}{\text{(s)}} \to {\text{2NaBr(s)}} + {\text{3}}{{\text{O}}_{\text{2}}}{\text{(g)}}\]

What amount, in mol, of \({\text{NaBr}}{{\text{O}}_{\text{3}}}\) produces \({\text{2.4 d}}{{\text{m}}^{\text{3}}}\) of oxygen gas, measured at room temperature and pressure? (Molar volume of gas \( = {\text{24 d}}{{\text{m}}^{\text{3}}}{\text{mo}}{{\text{l}}^{ - 1}}\) at room temperature and pressure.)

A.     0.017

B.     0.067

C.     0.10

D.     0.15

Markscheme

B

Examiners report

[N/A]

Syllabus sections

Core » Topic 1: Stoichiometric relationships » 1.3 Reacting masses and volumes
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