Question

Please Help!!

how much heat will be released when 10.0g of hydrogen peroxide decomposes according to the following reaction:
2H2O2(l)--> 2H20(l)+ O2(g) H= -190 KJ

Answer 1

Enthalpy of decomposition is measured in kilojoules per mole, so we need to know how much material we’re working with.

Ten grams of hydrogen peroxide is 0.294 moles (formula weight: 34.014 grams per mole), so we can run the reaction 0.147 times (0.294 moles divided by the two moles per run requirement). This means the reaction has a heat loss equivalent to:

0.147 x -190 kJ

or -27.93 kJ through the reaction.