volume of nh3 gas is 3.1 L
Utilizing stoichiometry, first convert g of H2O to mol of NH3. Six moles of water react to produce two moles of NH3 in the balanced reaction. H2O and NH3 have a mole ratio of 6:2, therefore 7.5 g H2O times (1 mol H2O / 18.02 g H2O) times (2 mol NH3 / 6 mol H2O) equals 0.14 mol NH3 Next, at STP, a mole of a gas takes up 22.4 L of space.
Produced NH3 volume equals 0.14 mol times (22.4 L / 1 mol) equals 3.1 L
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