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Question 49

Figure 1 shows a graph of the results of an experiment measuring the volume of hydrogen gas produced over time.

A tangent has been drawn on the curve at a time of 40 seconds.

Figure 1: A line graph showing the volume of hydrogen gas produced in cm³ against time in seconds. The y-axis represents the volume of hydrogen gas and is numbered from 0 to 80 in intervals of 10, with minor grid lines every 2 cm³. The x-axis represents time in seconds and is numbered from 0 to 120 in intervals of 20, with minor grid lines every 4 seconds. The curve starts at (0, 0), passes through (40, 48), and continues to flatten out towards 80 seconds. A straight tangent line is drawn, touching the curve at exactly the point corresponding to 40 seconds and a volume of 48 cm³.

State the total volume of hydrogen gas produced in the first 40 seconds.

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