Final answer:
From 16.0 grams of oxygen gas, 9.01 grams of water are made.
Step-by-step explanation:
To find out how many grams of water are made from the reaction of 16.0 grams of oxygen gas, we need to use the balanced equation for the reaction: 2H₂O₂ → 2H₂O. From the equation, we can see that 1 mole of oxygen gas (O₂) reacts to form 2 moles of water (H₂O). Given that the molar mass of oxygen is 32.0 grams/mol, we can calculate the number of moles of oxygen gas in 16.0 grams (16.0 g / 32.0 g/mol = 0.5 mol). Since the ratio of O₂ to H₂O is 1:2, this means that 0.5 mol of oxygen gas will react to form 1 mol of water. The molar mass of water is 18.02 grams/mol, so the mass of water formed from 16.0 grams of oxygen gas is 0.5 mol * 18.02 g/mol = 9.01 grams.