7a. hydrogen peroxide decomposes into water vapor and oxygen. suppose you have 225 g of a solution that is 50% hydrogen peroxide by mass. what volume of oxygen can be produced at 25oc and 792 torr?

38.7L

Explanation:

First we must write the balanced reaction equation. We can obtain the mass of H2O2 in the solution by applying the fact that it accounts for 50% by mass of solution as shown in the image attached. Then we calculate the number of moles of hydrogen peroxide present. From PV=nRT, we obtain the volume of H2O2. By applying the stoichiometry of the reaction, we obtain the volume of oxygen evolved in the reaction as shown in the image attached