Explain why the flask and its contents lose mass during the reaction between calcium carbonate and dilute hydrochloric acid.
A student plotted the loss of mass against time. To find the rate of reaction at a specific time, they drew a tangent to the curve. The tangent line passes through the points (24 s,0.38 g)(24\text{ s}, 0.38\text{ g})(24 s,0.38 g) and (88 s,0.95 g)(88\text{ s}, 0.95\text{ g})(88 s,0.95 g).
Determine the rate of reaction represented by this tangent. Give your answer to 2 significant figures and include the appropriate units.