Describe one way of measuring the rate of a reaction which produces a gas?

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If an acid in a reaction becomes more concentrated will the rate of reaction increase or decrease? How do you calculate the average rate of reaction? Why do you draw a tangent on the curve when measuring gradient on a graph? If 80cm^3 of product is used up in 20s what is the rate of the reaction? Give your answer in cm^3/s Explain why a lower reactant concentration causes a decrease in the rate of the reaction.