Explain why an open flask containing zinc carbonate and dilute nitric acid loses mass as the reaction proceeds.
A student plotted the cumulative loss of mass against time for this reaction. To find the rate of reaction at a specific time, they drew a tangent to the curve. The tangent line passes through the points (22 s,0.29 g)(22\text{ s}, 0.29\text{ g})(22 s,0.29 g) and (86 s,1.16 g)(86\text{ s}, 1.16\text{ g})(86 s,1.16 g).
Determine the rate of reaction represented by this tangent. Give your answer to 2 significant figures and include the appropriate units.