1C3H8 + <em>5</em>O2 → 3CO2 + 4H2O
100 / 1 = X / <em>5</em>
X = 100 × 5 / 1 = 500 л
M(KNO3)=39+14+48=101
w(K)=39*100/101=38,61%
w(N)=14*100/101=13,86%
w(O)=48*100/101=47,53%