How many photons are produced in a laser pulse of 0.186J at 663nm

Used the balanced equation 2h2+ o2 - -> 2h2o. if you have 7.2 grams of o2 , how many grams of h2o can you produce ?

What is the empirical formula of c6h18o3? ch3o c2h5o c2h6o c2h5o5

There is one girl i like and i don't know how to tell her that, i have a feeling she knows but if she doesn't i don't want to make a fool out of myself how is one way to boost my confidence on asking her out