0.10 mole of C4H10O reacts completely with molecular oxygen, O2 - VCE - SSCE Chemistry - Question 5 - 2005 - Paper 1

To determine the number of moles of oxygen, we first refer to the balanced chemical reaction for the combustion of C4H10O:

$C4H10O + 6 O2 \rightarrow 4 CO2 + 5 H2O$

From the balanced equation, we see that 1 mole of C4H10O reacts with 6 moles of O2. Given that we have 0.10 moles of C4H10O, we can calculate the required moles of O2:

$\text{Moles of O2} = 0.10 \text{ moles C4H10O} \times \frac{6 \text{ moles O2}}{1 \text{ mole C4H10O}} = 0.60 \text{ moles of O2}$

Therefore, the number of moles of oxygen molecules used is 0.60.