A student monitors the progress of a reaction between calcium carbonate and dilute hydrochloric acid by measuring the total mass of the flask and its contents on a digital balance as carbon dioxide gas escapes. The results are plotted on the graph below:
What is the average rate of reaction, in mg s−1\text{mg s}^{-1}mg s−1, in terms of the mass loss of the flask during the first 30 seconds?
0.030 mg s−10.030 \text{ mg s}^{-1}0.030 mg s−1
30 mg s−130 \text{ mg s}^{-1}30 mg s−1
40 mg s−140 \text{ mg s}^{-1}40 mg s−1
4970 mg s−14970 \text{ mg s}^{-1}4970 mg s−1