M,HNO3= 63g/mol
niu=m/M= 10mol HNO3
1mol HNO3.........1mol at H........3mol at O
10mol..................x= 10mol H............Y=30molO
1mol atomi..........6,023x10²³ atomi
10mol at.H.............x= 6,023x10²⁴atmoIH
30mol atO............Y= 18,069x10²⁴ atomi O