2H2 + O2 → 2H2O If 16.00 g of hydrogen gas reacts with 126.73 g of oxygen, how many grams of water are yielded?

How many moles of al3+ ions are in 1.25 moles of al2o3

In a laboratory, 1.55mg of an organic compound containing carbon, hydrogen, and oxygen is burned for analysis. this combustion resulted in the formation of 1.45mg of carbon dioxide and .89 mg of water. what is the empirical formula for this compound?

The rate constant for the reaction below is 6.2 x 10−5 mol l−1 s −1. if the initial concentration of a is 0.0500 m, what is its concentration after 115 s?