Calculate the volume of air required to completely burn 10 g of phosphorus.

univerkov | December 3, 2020 | education

4P + 5O2 = 2P2O5
n (P) = m \ M = 10 \ 31 = 0.32 mol
for ur-th p-i n (O2) = 0.32 * 5 \ 4 = 0.4 mol
V (O2) = n * Vm = 0.4 * 22.4 = 8.96 l
volume fraction of oxygen in air 0.21 (21%)
V air = V (O2) \ 0.21 = 8.96 \ 0.21 = 43 l
Answer: 43 l

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