O-LevelChemistryRates of Reaction5070/11 · May/June 2017 · Q201 Mark

At the start of a reaction, a 1.00 dm³ solution contains 0.300 mol of ethanol. After 100 seconds the concentration of the ethanol has decreased to 0.296 mol/dm³. What is the rate of reaction over the first 100 seconds?

A2.96 × 10³ mol/dm³/s

B3.00 × 10⁵ mol/dm³/s

C4.00 × 10⁻⁵ mol/dm³/s

D8.00 × 10⁵ mol/dm³/s

✓ Correct answer

C: 4.00 × 10⁻⁵ mol/dm³/s

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Topic: Rates of Reaction, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2017 Paper 1 Variant 1, question 20.

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