293k,100kpa下,使3dm3干燥气体缓慢通过一CS2记泡器,带走6.24gCS2.计算CS2的饱和蒸汽压

Question

293k,100kpa下,使3dm3干燥气体缓慢通过一CS2记泡器,带走6.24gCS2.计算CS2的饱和蒸汽压

Answer 1

1、求未知的干燥气体的物质的量ni
P总Vi = ni RT
ni = P总 Vi / RT
= 100 * 3 / 8.314*293
= 0.1232 (mol)
2、求n总
n总 = ni + n(CS2)
= 0.1232 + 6.24 / Mr(CS2)
= 0.1232 + 6.24 / 76
= 0.2053 (mol)
3、求V总
P总 V总 = n总 RT
V总 = n总 RT / P总
= 0.2053 *8.314 * 293 /100
= 5（dm3)
4、求P（CS2）
P(CS2) V总 = n (CS2) RT
P(CS2) = n (CS2) RT / V总
= (6.24/76) * 8.314 * 293 / 5
= 40(kPa)