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Case study·Standard multi-step (3/5)·No calculator

Difficulty guide

The label describes the problem, not your ability.

1/5 - Foundational

Warm-up setup; checks one basic idea.

2/5 - Routine exam skill

Normal syllabus skill; usually one main rule or interpretation.

3/5 - Standard multi-step

Exam-style problem with multiple steps or a common trap.

4/5 - Hard exam skill

High-end exam problem; combines methods carefully.

5/5 - Challenge

Stretch problem beyond normal exam pressure.

Question

A bottle contains 0.200 mol0.200\text{ mol} of ammonia, NH3\mathrm{NH_3}. Take NA=6.022×1023N_A=6.022\times10^{23} and M(NH3)=17.0 g mol−1M(\mathrm{NH_3})=17.0\text{ g mol}^{-1}.
Total: 5 marks

(a) Find the number of ammonia molecules. (2 marks)

(b) Find the mass of ammonia. (2 marks)

(c) Find the total moles of hydrogen atoms present. (1 mark)

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cbse-chemistry-11.u1.t1-2.case.010

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