If 7.6 moles of H2O are produced from the reaction how many moles of O2 were used?

Number of moles of oxygen used=13.5moles

Explanation:

To know the number of moles of oxygen used, first calculate the molar mass of water.

H2O=(2*1)+(1*16)

=2+16

18g/mol of H2O

The moles of H2O is 7.6 moles

So first, find the molar mass of oxygen

O2=2*16

=32g/mol

Then, number of moles of oxygen is equal to molar mass of oxygen divide by the molar mass of water times the number of moles of water

No. moles of O2=[32g/mol]/[18g/mol] *7.6moles

Moles of O2=1.778*7.6moles

No.moles of O2=13.5 moles

Therefore, the number of moles of oxygen used was 13.5moles