Changing the concentration of the reactants

2 marks · Easy

In an experiment, 0.27 g of oxygen gas is produced in 45 seconds during the reaction of hydrogen peroxide with manganese(IV) oxide. Calculate the average rate of oxygen production during this time. Give your answer in g/s.

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0.0060 g/s (±0.0002)

Also accept: 0.27/45 = 0.006 g/s

Common mistakes: Using incorrect formula (e.g. dividing time by mass)

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Marking points

M1 · 1 mark · Divides the mass of oxygen produced by time (0.27/45).

A1 · 1 mark · Correct final answer: 0.0060 g/s (allow 0.006).

Worked solution

Average rate = mass of gas produced / time