A student was given 118 mL sample of hydrogen peroxide. The density of hydrogen peroxide is 1.11 g/mL. The entire sample of hydrogen peroxide was allowed to decompose into water and oxygen gas.

Although this question is incomplete and i could not get the complete question online as well but to calculate the mass of the hydrogen peroxide, we use the formula below,

Density = mass/volume

But density = 1.11g/ML

Volume = 118ML

Therefore mass of hydrogen peroxide = 1.11 * 118

= 130.98g