How many moles are in 196 g of H2SO4?

Calcium hydride (cah2) reacts with water to form hydrogen gas: cah2(s) + 2h2o(l) → ca(oh)2(aq) + 2h2(g) how many grams of cah2 are needed to generate 45.0 l of h2 gas at a pressure of 0.995 atm and a temperature of 32 °c?

What is the percent by mass of oxygen in fe2o3

The atomic number, or number, is the described as the number of in the nucleus of an chemical element.