Fe +2HCl \(\rightarrow\)FeCl2 + H2 (1)
nFe=\(\dfrac{11,2}{56}=0,2\left(mol\right)\)
Theo PTHH 1 ta có:
nFe=nFeCl2=nH2=0,2(mol)
mFeCl2=127.0,2=25,4(g)
C% dd FeCl2=\(\dfrac{25,4}{11,2+89,2-0,2.2}.100\%=25,4\%\)
c;
CuO + H2 \(\rightarrow\)Cu + H2O (2)
nCuO=\(\dfrac{12}{80}=0,15\left(mol\right)\)
Vì 0,15<0,2 nên H2 dư
Theo PTHH 2 ta có:
nCuO=nCu=0,15(mol)
mCu=64.0,15=9,6(g)