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C₃H₈ + 5 O₂ ---> 3CO₂ + 4H₂O
x+y=16 --------> x=16-y
2x+5y=68
2(16-y)+5y=68
32-2y+5y=68
3y = 36
y = 12
x=16-y
x=16-12
x = 4
16cm³ mieszaniny ---- 100%
4cm³ metanu ---------- x%
x = 25% metanu
100% mieszaniny - 25% metanu = 75% propanu