[tex]n = \frac{m}{mm} [/tex]
n=numar de moli
m=masa
mm=masa moleculara
a)mCO2=4 G
MCO2=12 + 32 = 44g
n=m/M=4/44=1/11 =0.09 moli
b)mCaCO3= 25 g
MCaCO3= 40 + 12 + 48= 100
n=m/M=25/100=1/4= 0.25 moli
c)mSO3=320 g
MSO3=32+48=80 g
n=m/M=320/80=4 moli
d)mHNO3=63 G
MHNO3=1+14+48=63 g
n=m/M=63/63=1 mol