How to fix a spell on hexes

If 0.414 g of hydrogen is obtained in this experiment how many grams of sulfur must be obtained

Transportation is the largest single source of air pollution in the united states. air pollution can harm the environment and human health. which technology could offer a solution to this problem? mufflers that reduce noise motors that run on electricity tires that improve gas mileage

What does the mass of 0.7891 mol of ferric oxide (fe2o3)