Calculate the mean rate of reaction when 32.5 cm³ of gas is produced in 250 seconds using mean rate

What you are finding

You are asked for the mean (average) rate of reaction based on how quickly a gas is produced. The formula given already tells you to divide the gas volume by the time.

Substituting the values into the formula

Given:

• Volume of gas produced $= 32.5\ \text{cm}^3$
• Time taken $= 250\ \text{s}$

Compute: $$ \text{mean rate} = \frac{\text{volume}}{\text{time}} = \frac{32.5}{250} $$

Calculating and writing correct units

$$ \frac{32.5}{250} = 0.13 $$ Units: $$ \frac{\text{cm}^3}{\text{s}} = \text{cm}^3\,\text{s}^{-1} $$ So the mean rate is $0.13\ \text{cm}^3\,\text{s}^{-1}$.