Chemistry Help with determining the number of moles!

Question

What is the number of moles of H2O formed when 1 mole of O2 reacts with C5H12 in the reaction C5H12 802 > 5CO2 6H2O?

> denotes an arrow pointing to the right

Answer 1

C5H12 802 > 5CO2 6H2O

1 mole O2 x (6 moles H2O / 8 moles O2) = 0.75 moles H2O

Answer 2

Take a look at the formula:

C5H12 802 > 5CO2 6H2O

You know that 8 moles of O2 create 6 moles of H2O.

So 1 mole of O2 created 1 / 8 * 6 = 6/8 = 3/4 = 0.75 moles of H2O

Answer 3

First you have to assume tht the C5H12 is in excess.  

Use unit cancellation, it helps ==== 8 O2 = 6H2O

1 mol O2 X (6H2O/8O2) = 0.75 mols H2O

Answer 4

Actually

C5H12 802 > 5CO2 6H2O

1 mole O2 x (6 moles H2O / 8 moles O2) = 0.75 moles H2O