Introduction to chemical engineering

The different (convoluted) information in the question have been broken down and analysed separately. Annotations have been done to form a clearer picture of the situation. Note that the extent of the equation here is calculated based on the balanced equation where 1 CH3OH reacts with 0.5 O2. If you have balanced the equation where 2 CH3OH reacts with 1 O2, the extent of reaction would be 0.45 and 0.075 respectively, but the final answer would be the same.