提问:计算1小时2000Nm³氮气流量需要液氮多少kg
* O, r9 ?+ K1 c7 k/ d3 G6 }8 v一、1m³=1000000cm³,1m³液氮的质量m=0.808×1000000=808000g;
0 p0 h3 Q# _: H/ R二、氮气的摩尔质量M=28g/mol,物质的量n=m/M,1m³液氮的物质的量n=808000/28≈28857.14mol;
6 o3 k3 ^2 ]4 ^; ?三、根据理想气体状态方程PV=nRT,在标况下,P=101.325kPa,T=273.15K,R=8.314J/(mol·K)来计算标方数V=28857.14×8.314×273.15/101.325=646.6Nm³,即1m³液氮汽化氮气为646.6Nm³8 A" [" `5 f C) v9 b
7 E$ S/ u% w& c- r四、已知液氮密度0.808g/cm³(0.808吨/m³)按汽化比算:质量=密度*体积,液氮m=0.808×(2000/646.6)=2.499226724,约为2.5吨液氮9 y) E" B/ e" H/ [
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