Using the equation, c5h12 + 8o2 imported asset 5co2 + 6h2o, if an excess of pentane (c5h12) were supplied, but only 4 moles of oxygen were available, how many moles of water would be produced?

3 moles of water would be produced in present case.

Reason:
Reaction involved in present case is:
                            C5H12 + 8O2 → 5CO2 + 6H2O

In above reaction, 1 mole of C5H12 reacts with 8 moles of oxygen to give 6 moles of water.

Thus, 4 moles of oxygen will react with 0.5 mole of C5H12, to generate 3 moles of H2O.