Chemistry · May / June 2017 · Paper 11 · Question 20

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?

1. A2.96 × 10⁻³ mol / dm³ / s
2. B3.00 × 10⁻⁵ mol / dm³ / s
3. C4.00 × 10⁻⁵ mol / dm³ / s
4. D8.00 × 10⁻⁵ mol / dm³ / s

As printed in the paper