Calculate the number of grams of oxygen

Question

In the presence of UV light, hydrogen peroxide, H₂O₂(l), decomposes to liquid water and oxygen gas. Calculate the number of grams of oxygen gas that can be made when 2.364 grams of hydrogen peroxide decomposes.

Answer 1

Hello, Ana,

The baLanced equation is needed. I get:

2H₂O₂ = 2H₂O + O₂

Find moles H₂O₂ 2.364g/(34g/mole ) = 0.06953 moles

The molar ratio between O₂ and H₂O₂ is 1/2.

We'll get (1/2)*(0.06953 moles) = 0.03476 moles O₂

Multiply by the molar mass of O₂ to find grams. I get 1.112 grams O₂.