某未知氣體樣品為5.0克,在溫度為1000°C時,壓力為291;kPa時體積是0.86;L,該氣體的摩爾質量是。A.42;g/molB.52;g/molC.62;g/molD.72;g/mol正確答案:62;g/mol 點擊顯示答案