The following reaction represents the decomposition of hydrogen peroxide:

Question

Balanced equation: 2H2O2 -> O2 + 2H2O

How many moles of oxygen are produced from the decomposition of 3.4g of hydrogen peroxide?

How many molecules of O2 are produced?

For the second question, is the answer 1 molecule?

Answer 1

2H2O2 ==> 2H2O + O2
3.4g is how many moles of H2O2? That is moles = grams/molar mass.
The equation tells you that 1 mole O2 is produced by 2 moles H2O2.

For the last part, no, 1 is not the answer. Remember there are 6.022E23 molecules in 1 mole.

Answer 2

Thank you!
For the second question could you tell me how to find the answer?

Answer 3

# molecules = mols O2 x 6.022E23 = ?