Question

用蒸汽密度法測(cè)定物質(zhì)的相對(duì)分子質(zhì)量是一種常用的方法。現(xiàn)測(cè)得0.2g某揮發(fā)性液體化合物樣品在揮發(fā)時(shí)排出的空氣在標(biāo)準(zhǔn)狀況下是40mL，則該化合物的相對(duì)分子質(zhì)量是

                                                                                                                             （   ）                                                          

A．80

B．112

C．168

D．340

Answer 1

B

0.2g某揮發(fā)性液體化合物樣品在揮發(fā)時(shí)排出的空氣在標(biāo)準(zhǔn)狀況下是40mL，根據(jù)氣體摩爾體積和摩爾質(zhì)量的關(guān)系，該化合物的相對(duì)分子質(zhì)量是112.