How many grams of Calcium hydride are needed to react with excess water to form 5.0 grams of hydrogen gas?
CaH2 + 2H2O->Ca(OH)2 + 2H2
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There are four steps to answering this type of stoichiometry problem.
Write the balanced equation for the reaction.
Use the molar mass of H2 to convert grams of H2 to moles of H2.
Use the molar ratio from the balanced equation to convert moles of H2 to moles of CaH2.
Use the molar mass of CaH2 to convert moles of CaH2 to grams of CaH2.
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