Homework Answers
The balanced chemical reaction is:
4 NH3 + 3 O2 
2 N2 + 6 H2O
5. Moles of NH3 = mas / molar mass = 38.7 / 17 = 2.276 moles
From the equation, moles of N2 formed = 1/2 * mole sof NH3 = 1/2 * 2.276 = 1.138 moles
Mass of N2 = moles * molar mass = 1.138 * 28 = 31.864 g
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