平均摩爾質(zhì)量:11.2*2 = 22.4 g/mol
溴水增重4.2g,混合氣中烯烴4.2g,烷烴9-4.2 = 4.8 g
最簡單的烯烴為乙烯,摩爾質(zhì)量26g/mol > 22.4 g/mol,烷烴摩爾質(zhì)量必須小于22.4g/mol,只能是甲烷
混合氣中甲烷4.8/16 = 0.3 mol
設(shè)烯烴摩爾質(zhì)量x g/mol,
混合氣物質(zhì)的量 = 0.3 + 4.2/x mol
平均摩爾質(zhì)量:9/(0.3 + 4.2/x) = 22.4
x = 41.2 g/mol
丙烯
C平均摩爾質(zhì)量為什么是: 11.2*2 = 22.4 g/mol？它只是密度有倍數(shù)關(guān)系啊1mol氫氣2 g, 1mol該組成的氣體質(zhì)量為2*11.2pV = (W/M)RTd = W/V = pM/(RT)相同狀況下密度d與摩爾質(zhì)量成正比(混合氣在組成確定時, 有摩爾質(zhì)量: 1mol混合氣質(zhì)量)