Răspuns:
a) n=m/M=22/44=0,5 moli
b) n=m/M=5,1/102=0,05 moli
c) n=m/M=39,2/98=0,4 moli
d) 21kg HNO3= 21000g HNO3
n=m/M =21000/63=333,(3) moli
Explicație:
n=numarul de moli
M-masa moleculara
m-masa in grame!!!
M CO2= Ac + Ao •2=12+16•2=44 u.a.m
M Al2O3= A Al•2 +Ao•3=102 u.a.m
M H2SO4=Ao•2+As+Ao•4=98 u.a.m.
M HNO3=A H+A N+ Ao•3=63 u.a.m.