Answer:32 grams
Explanation:The best way is to look at the reaction between Oxygen and Hydrogen, and then balance it:2H2+O2→2H2OFrom this we can see the molar ratios.Now, 36 grams of water equals two moles of water from the equation:n=mM m=36gM=18gmol−1)Hencen=2 (moles)Thus according to the molar ratio, we should have half the amount of moles, that is one mole of diatmoic oxygen. 1 Oxygen atom has a mass of 16 grams, thus diatomic oxygen weights twice as much- 32 grams.Hence 32 grams is needed.