4NH3 + 5O2 > 4NO + 6H2O How many moles of NO are produced from 9.32 grams of oxygen?

the answer is not 0.166 moles i tried and did not get credit for.

Astudent carefully transfers 30 g of water and 30 g of alcohol in a glass tube, forming two layers and filling the tube completely. after sealing the tube, the student mixes the solutions, and notices a bubble that forms in the tube. what is the mass of the contents in the glass tube after mixing?