What units can you use to measure the rate of a reaction?

The correct choice is based on the fact that measuring the rate of a reaction typically involves quantifying the change in concentration of reactants or products over time. The units used for this measurement must reflect the amount of substance transformed per unit of time.

In this case, grams per second (g/s) indicates the mass of a substance changing over time, cubic centimeters per second (cm³/s) measures the volume of a gas produced or consumed over time, and moles per second (mol/s) signifies the number of moles of a substance involved in the reaction rate. These units directly link the quantitative measure of the material to a specific timeframe, which is crucial in determining the reaction rate.

The other options, while they contain some valid units, either do not uniformly reflect the same type of measurement or are less commonly used for expressing reaction rates in a clear manner. For instance, moles per liter generally refers to concentration rather than a direct rate, and other units may focus on different aspects, such as total change rather than instantaneous rate. Therefore, the chosen answer effectively encompasses units that precisely measure how quickly a reaction occurs, providing clarity and usefulness in a chemical context.