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14. C3H8 ==> (12(3) : 1(8)) = 36 : 8 = 9 : 2 => (e)
15. 2 SO2 + O2 => 2 SO3
mol SO2 = 64gr / 64 gr/mol = 1 mol
mol SO3 = 160gr / 80 gr/mol = 2 mol
mol O2 = 1/2 x mol SO2 = 1/2 x 1 mol = 0,5 mol
massa O2 = 0,5 mol x 32 gr/mol = 16 gr
16. senyawa I = A : B = 75 : 25 = 3 : 1
senyawa II = A : B = 50 : 50 = 1 : 1
S I : S II = 3 : 1
17. 2 N2 + 5 O2 => 2 N2O5
V O2 = 5 liter
V N2O5 = 2/5 x V O2 = 2/5 x 5 liter = 2 liter
18. N2 + 3 H2 => 2 NH3
molekul NH3 = 16 molekul
molekul N2 = 1/2 x 16 = 8 molekul
molekul H2 = 3/2 x 16 = 24 molekul
19. Mr Fe2(SO4)3 = 2Fe + 3S + 12O = 2(56) + 3(32) + 12(16) = 400
20. mol x = 3,01 x10²² / 6,02 x10²³ = 0,05 mol
Ar x = 3 gr / 0,05 mol = 60
21. jumlah partikel terkecil = mol terkecil = Mr terbesar
a. C6H12O6 Mr = 180