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Unformatted text preview: the limiting reactant. The limiting reactant could be either H 2 gas or N 2 gas. We could figure out which one is the limiting reactant by seeing which one would make less product if it were to react completely. This can be done using dimensional analysis. We us the balanced equation, 3 H 2 + N 2 = 2NH 3 56g N 2 │1mol N 2 │2mol NH 3 │ = 4mol NH 3 28g N 2 │1mol N 2 │ 44.8L H 2 │1mol H 2 │2mol NH 3 │ = 1.3mol NH 3 22.4L H 2 │3mol H 2 │ *note: don’t be confused because H 2 is given in liters. Remember that 1 mol of gas at STP occupies 22.4L. If you forget this, you can always plug in the standard temperature and pressure conditions (273K, and 1atm) into the ideal gas equation(PV = nRT). It looks like H 2 is the limiting reactant because it creates less product, and that it produces 1.3 moles of NH 3 ....
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This document was uploaded on 11/04/2011 for the course CHEM 106 at BYU.
- Fall '08