Question

Cati moli din fiecare subst se gasesc in 10g H2O
20g NH3
10g HC

Answer 1

n=m/M
n=nr de moli
m= masa de substanta
M=masa molara

Masa H2O=1+1+16=18
n=10/18=0.55 moli/l

Masa NH3=14+1+1+1=17
n=20/17=moli/l

Masa HCl( cred ca asa ai vrut sa scrii)
HCl=1+35.5=36,5
n=10/36,5=0.27 moli/l