3Mg + N2 → Mg3N2
M(Mg) = 24.3 g/mol
n(Mg) =24.340.0=1.646mol
According to the reaction equation
n(N2) =31n(Mg)=31×1.646=0.548mol
Ideal gas low
pV = nRT
p= 2.25 atm
T=15 + 273 = 288 \;K
R = 0.08206 L×atm/mol×K
V=pnRTV(N2)=2.250.548×0.08206×288=5.756L
Answer: 5.756 L
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