Question

烃的计算某烃的密度在标况下是2.59g/l,此烃分子中含碳82.8%,求该烃的分子式.

Answer 1

由n = m/M = V/Vm,可知,ρ = m/V = M/Vm

则摩尔质量 M = 2.59×22.4 = 58 g/mol

C：H = 82.8% /12：(1-82.8%)/1 = 2：5,

则烃的最简式为C2H5．

设其分子式为(C2H5)x,则有(12×2+5)*x= 58,

解得x = 2,

所以烃的分子式为C4H10,