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persamaan reaksinya :
C3H8(g) + 5 O2(g) => 3 CO2(g) + 4 H2O(g)
massa C3H8 = 2,2 gr
Mr C3H8 = 44
mol C3H8 = 2,2 gr / 44 gr/mol = 0,05 mol
perbandingan koefisien C3H8 : CO2 = 1 : 3
mol CO2 = 3/1 x mol C3H8 = 3/1 x 0,05 mol = 0,15 mol
V STP = 22,4 liter/mol
V CO2 STP = 0,15 mol x 22,4 liter/mol = 3,36 liter