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wzór ogólny: CnH2n
C10H20= 12*10+20=140u
b)
wzór ogólny CnH2n+2
2n+2=8
2n=8-2
2n=6:2
n=3
C3H8=3*12 + 8=44u
b)masa cząsteczkowa C3H8=3*12u+8*1u=44u