How many grams of CaH2 are needed to generate 54.5L of gas if the pressure of is 815 torr at 20C?
2 answers
Use PV = nRT to calculate n, number of moles. moles and molar mass will get grams of H2. Then convert grams H2 to grams CaH2. Post your work if you get stuck.
The question is to find grams of CaH2. The balanced chemical equation is:
CaH2 + 2H2O --> Ca(OH)2 + 2H2
This mole ratio must be taken into account.
Find the moles of H2 as DrBob showed you, then multiply by 1/2 to get moles of CaH2. Finally convert moles of CaH2 to grams.
CaH2 + 2H2O --> Ca(OH)2 + 2H2
This mole ratio must be taken into account.
Find the moles of H2 as DrBob showed you, then multiply by 1/2 to get moles of CaH2. Finally convert moles of CaH2 to grams.
1 answer