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C + O2 ---- CO2
mC = 12g/mol
mCO2 = 44g/mol
44g/mol ------ 30kg
12g/mol ------ xkg
x = 12 x 30 : 44 = 8,19kg
87% ---- 8,19kg
100% ---- ykg
y = 100% x 8,19 : 87% = 9,4kg