# Stoichiometric Calculations

### Problems

Problem :

 4NH3(g) + 6NO(g)→5N2(g) + 6H2O(g)

How many moles of each reactant were there if 13.7 moles of N2(g) is produced?

Problem : What is the mass of 2 moles of H2S ?

Problem : 2Al +3Cl2→2AlCl3

When 80 grams of aluminum is reacted with excess chlorine gas, how many formula units of AlCl3 are produced?

Problem : Sb2S3(s) + 3Fe(s)→2Sb(s) +3FeS(s)

If 3.87×1023 particles of Sb2S3(s) are reacted with excess Fe(s), what mass of FeS(s) is produced?

Problem : CO(g) +2H2(g)→CH3OH(g)

At STP, what volume of H2(g) is needed to react completely with 8.02×1023 molecules of CO(g)?

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