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= 24+6+16
=46
molC2H5OH = massa/Mr
= 100/46 mol
a. V oksigen , cari mol oksigen dulu
mol oksigen = koefisien oksigen/koefisien alkohol × mol alkohol
=3/1 × 100/46
= 300/46 mol
V oksigen = mol × V STP
= 300/46 × 22,4
= 146,08 L
b. Cari mol CO2
molCO2 = 2/1 × 100/46
= 200/46 mol
Mr CO2 = 12+16×2
=12+32
=44
massa = mol × Mr
= 200/46 × 44
= 191,40 gram