提问:计算1小时2000Nm³氮气流量需要液氮多少kg
5 E$ s# n3 [0 z% ]3 Q4 d% W一、1m³=1000000cm³,1m³液氮的质量m=0.808×1000000=808000g;$ r0 d6 M+ ]: z4 w8 n+ Y! J
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;
1 } ?4 M8 X0 M/ R! ?. ]+ y! M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646.6Nm³, w9 O8 X4 L, w" u7 O, A
8 m; e7 J2 j- j$ ?0 _ L, L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% x6 X* T: T& O# T' A1 l
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