Final answer:
The formula that can be used to calculate the molar mass of hydrogen peroxide (H2O2) is d. 2 x molar mass of H + 2 x molar mass of O.
Step-by-step explanation:
The formula that can be used to calculate the molar mass of hydrogen peroxide (H2O2) is d. 2 x molar mass of H + 2 x molar mass of O. This is because hydrogen peroxide consists of two hydrogen atoms and two oxygen atoms.