Question

Care este masa de O2 continuta intr-un vas de 500ml la 20 de grade si 1 atm? Cate molecule de O2 sunt in aceasta cantitate?

Answer 1

ecuatia de stare a gazelor:  PV = niuRT--->PV=m/M RT
M,O2= 32g/mol;  
 T= 20+273=293 grdKelvin
1x500= m/32 x0,082 x293----> m=666g O2--> niu=m/M=666/32=20,8mol

1 mol.O2...contine 6,023x10²³ molecule   
20,8...........................n= 20,8X6,023X10²³molecule   CALCULEAZA !!!!!!!