Bài 1:

\(Na_2O+H_2O\rightarrow2NaOH\\ SO_2+H_2O⇌H_2SO_3\\ HCl+KOH\rightarrow KCl+H_2O\\ Na_2O+2HCl\rightarrow2NaCl+H_2O\\ SO_2+2KOH\rightarrow K_2SO_3+H_2O\\ KOH+SO_2\rightarrow KHSO_3\\ CaCO_3+2HCl\rightarrow CaCl_2+CO_2+H_2O\\ SO_2+Na_2O\rightarrow Na_2SO_3\)

Bài 2 nếu m_HCl= 7,3(g) thì đúng hơn 7,1(g) nên anh sửa là 7,3 gam nha em.

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Theo ĐLBTKL,ta có:

\(m_{Zn}+m_{HCl}=m_{ZnCl_2}+m_{H_2}\\ \Leftrightarrow6,5+7,3=m_{ZnCl_2}+0,2\\ \Leftrightarrow m_{ZnCl_2}=\left(6,5+7,3\right)-0,2=13,6\left(g\right)\)

Bài 2 : 

Định luật bảo toàn khối lượng : 

\(m_{Zn}+m_{HCl}=m_{ZnCl2}+m_{H2}\)

6,50 + 7,1 = \(m_{ZnCl2}\) + 0,2

13,6 = \(m_{ZnCl2}\) + 0,2

⇒ \(m_{ZnCl2}=13,6-0,2=13,4\left(g\right)\)

 Chúc bạn hoc tốt

Sửa đề : 24.8 (g) Na₂O

\(n_{Na_2O}=\dfrac{24.8}{62}=0.4\left(mol\right)\)

\(n_{HNO_3\left(dư\right)}=\dfrac{50.4}{63}=0.8\left(mol\right)\)  

\(Na_2O+2HNO_3\rightarrow2NaNO_3+H_2O\)

\(0.4............0.8..............0.8...........0.4\)

\(m_{NaNO_3}=0.8\cdot85=68\left(g\right)\)

\(m_{H_2O}=0.4\cdot18=7.2\left(g\right)\)

\(n_{Ca}=\dfrac{8}{40}=0,2mol\\ 2Ca+O_2\xrightarrow[]{t^0}2CaO\\ n_{CaO}=n_{Ca}=0,2mol\\ n_{HCl}=\dfrac{18,25}{36,5}=0,5mol\\ CaO+2HCl\rightarrow CaCl_2+H_2O\\ \Rightarrow\dfrac{0,2}{1}< \dfrac{0,5}{2}\Rightarrow HCl.dư\\ n_{CaCl_2}=n_{CaO}=0,2mol\\ n_{HCl}=2n_{CaO}=0,4mol\\ m_{CaCl_2}=0,2.111=22,2g\\ m_{HCl.dư}=\left(0,5-0,4\right).36,5=3,65g\)

Bạn xem lại đề 

a)PTHH: ZnCl2+2KOH---->Zn(OH)2+2KCl

b)

mZnCl2=204.10100=20,4(g)ZnCl2=204.10100=20,4(g)

nZnCl2=20,4136=0,15(mol)ZnCl2=20,4136=0,15(mol)

nKOH=112.20%56=0,4(mol)KOH=112.20%56=0,4(mol)

=> 0,15/1 <  0,4/1=> KOH dư

Theo pthh, ta có :

nCu(OH)2=nZnCl2=0,15(mol)Cu(OH)2=nZnCl2=0,15(mol)

mCu(OH)2=0,15.98=14,7(g)Cu(OH)2=0,15.98=14,7(g)

c) m dd sau pư=204+112=316(g)

Theo pthh

nKOH=2nZnCl2=0,3(mol)KOH=2nZnCl2=0,3(mol)

C% KOH=

nKCl=2nZnCl2=0,3(mol)KCl=2nZnCl2=0,3(mol)

C% KCl=