计算时注意事项实例 Attentions: V=1m的容器有N2,温度为20℃,压力表读数 1000mmHg,pb=1atm,求N2质量。 M1000×1.0×28 168.4kg RT8.3143×20 i000 2) Im- pIM 1013×103×1.0×28 760 1531.5kg RT 8.3143×293.15 000 3)pM_N760 +1)×1.013×103×1.0×28 2658kg RT 8.3143×293.15 1000 pVM +1)×1.013×103×1.0×28 760 2.658k RT 8.3143×1000×293.15
计算时注意事项实例 Attentions: V=1m3的容器有N2，温度为20 ℃ ，压力表读数 1000mmHg，pb=1atm，求N2质量。 1000 1.0 28 168.4 8.3143 20 m pVM m kg R T = = = 1） 2） 1000 5 1.013 10 1.0 28 760 1531.5 m 8.3143 293.15 pVM m kg R T = = = 3） 1000 5 ( 1) 1.013 10 1.0 28 760 2658 m 8.3143 293.15 pVM m kg R T + = = = 4） 1000 5 ( 1) 1.013 10 1.0 28 760 2.658 m 8.3143 1000 293.15 pVM m kg R T + = = =
a The volume of the room is V=4mx5m×6m=120m3 a the mass of air in a room is determined from the ideal gas relation to be Pv 100×120 =140.3kg RT0.287×298/15
The volume of the room is V= 4m× 5m× 6m =120 m3 The mass of air in a room is determined from the ideal gas relation to be k g RT PV m 140.3 0.287 298 /15 100 120 = = =