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Difficulty: EasyRate of Reaction and Collision Theory

During a chemical reaction between dilute hydrochloric acid and calcium carbonate, 60 cm360\text{ cm}^3 of carbon dioxide gas is collected over a period of 30 seconds30\text{ seconds}. What is the average rate of evolution of the gas in cm3 s−1\text{cm}^3\text{ s}^{-1}?

Answer: 2 cm^3 s^-1

Answer

The average rate of gas evolution is 2.0 cm3 s−12.0\text{ cm}^3\text{ s}^{-1}.
The average rate of a reaction yielding a gas is given by dividing the total volume of gas produced by the total time taken. Dividing 60 cm360\text{ cm}^3 by 30 seconds30\text{ seconds} gives an average rate of 2.0 cm3 s−12.0\text{ cm}^3\text{ s}^{-1}.

Step-by-Step Solution

1
Identify the volume of gas evolved and the time duration.
Volume = 60 cm360\text{ cm}^3, Time = 30 seconds30\text{ seconds}.
These are the measured parameters required to calculate the average rate of reaction.
2
Calculate the average rate of reaction.
Rate=60 cm330 s=2.0 cm3 s−1\text{Rate} = \frac{60\text{ cm}^3}{30\text{ s}} = 2.0\text{ cm}^3\text{ s}^{-1}.
The reaction rate measures the change in concentration or amount of a reactant or product per unit time.

Key Concept

Rate of Reaction Calculation
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Topics

Rate of Reaction and Collision Theory