Question

The following thermochemical equation is for the reaction of H2O2(I) to form H2O(I) and O2(g)

Answer 1

7.08 grams

Explanations:

Given the reaction below;

`2H_2O_2\rightarrow2H_2O+O_2\text{ }\triangle H=-196kJ`

The reaction shows that 2 moles of 2O2 releases 196kJ of energy. Hence 1 moles of H2O2 will. release 98kJ of energy (196/2).

In order to create 20.4kJ of energy, we will need;

`moles\text{ of }H_2O_2=(20.4)/(98)=0.2082\text{ moles}`

Detemine the mass of H2O2

`\begin{gathered} Mass=mole* molar\text{ mass} \\ Mass\text{ of H}_2O_2=0.2082*34.02 \\ Mass\text{ of H}_2O_2=7.08grams \end{gathered}`

Hence the mass of H2O2 that will react is 7.08 grams