Mr(C3H8) = 12 x 3 + 1 x 8 = 44
w(C/C3H8) = 3Ar(C)/Mr(C3H8) x 100% = 3 x 12/44 x 100%= 81,82%
w(H/C3H8) = 8Ar(H)/Mr(C3H8) x 100% = 8 x 1/44 x 100%= 18,18%
Mr(C3H8) = 12 x 3 + 1 x 8 = 44
w(C/C3H8) = 3Ar(C)/Mr(C3H8) x 100% = 3 x 12/44 x 100%= 81,82%
w(H/C3H8) = 8Ar(H)/Mr(C3H8) x 100% = 8 x 1/44 x 100%= 18,18%