ta có: mdd sau pư= 10+ 200- 0,2. 2
= 209,6( g)
mMgCl2= 0,2. 95= 19( g)
mCuCl2= 0,065. 135= 8,775( g)
\(\Rightarrow\) C%MgCl2= \(\dfrac{19}{209,6}\). 100%\(\approx\) 9,065%
C%CuCl2= \(\dfrac{8,775}{209,6}\). 100%\(\approx\) 4,187%
ta có: nH2= \(\dfrac{4,48}{22,4}\)= 0,2( mol)
PTPU
Mg+ 2HCl\(\rightarrow\) MgCl2+ H2\(\uparrow\)
0,2.....0,4......... 0,2.......0,2... mol
CuO + 2HCl\(\rightarrow\) CuCl2+ H2O
0,065.....0,13.......0,065........... mol
\(\Rightarrow\) mMg= 0,2. 24= 4,8( g)
mCuO= 10- 4,8= 5,2( g)
\(\Rightarrow\) %mMg= \(\dfrac{4,8}{10}\). 100%= 48%
%mCuO= 100%- 48%= 52%
ta có: nCuO= \(\dfrac{5,2}{80}\)= 0,065( mol)
\(\Rightarrow\) nHCl= 0,4+ 0,13= 0,53( mol)
\(\Rightarrow\) mHCl= 0,53. 36,5= 19,345( g)
\(\Rightarrow\) C% HCl= \(\dfrac{19,345}{200}\). 100%= 9,6725%