Mr(CnH2n+2) = D(CnH2n+2/O2)*Mr(O2) = 2,25*32 = 72
Mr(CnH2n+2) = n*Ar(C) + (2n+2)*Ar(H) = n*12 + (2n+2)*1 = 12n+2n+2 = 14n+2
14n+2=72
14n=70
n=5
формула алкана C5H12
ω(C) = (5*Ar(C)/Mr(C5H12))*100% = (5*12/72)*100% ≈ 83,33%
ω(H) = 100% - ω(C) = 100% - 83,33% = 16,67%
Ответ: ω(C) = 83,33%, ω(H) = 16,67%
Mr(CnH2n+2) = D(CnH2n+2/O2)*Mr(O2) = 2,25*32 = 72
Mr(CnH2n+2) = n*Ar(C) + (2n+2)*Ar(H) = n*12 + (2n+2)*1 = 12n+2n+2 = 14n+2
14n+2=72
14n=70
n=5
формула алкана C5H12
ω(C) = (5*Ar(C)/Mr(C5H12))*100% = (5*12/72)*100% ≈ 83,33%
ω(H) = 100% - ω(C) = 100% - 83,33% = 16,67%
Ответ: ω(C) = 83,33%, ω(H) = 16,67%