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\(a,PTHH:Zn+HCl\rightarrow ZnCl_2+H_2\)
\(b,Áp.dụng.ĐLBTKL,ta.có:\)
\(m_{Zn}+m_{HCl}=m_{ZnCl_2}+m_{H_2}\\ m_{H_2}=m_{Zn}+m_{HCl}-m_{ZnCl_2}=9,75+10,95-20,4=0,3\left(g\right)\)
Zn+2HCl-to>ZnCl2+H2
0,3----0,6-----0,3----0,3
n H2=\(\dfrac{7,437}{24,79}\)=0,3 mol
=>m Zn=0,3.65=19,5g
=>m HCl=0,6.36,5=21,9g
=>m ZnCl2=0,3.136=40,8g
Fe2O3+3H2-to>2Fe+3H2O
0,1------0,3----------0,2 mol
=>m Fe=0,2.56=11,2g
a)\(n_{H_2}=\dfrac{7,437}{22,4}=0,332mol\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)
0,332 0,664 0,332 0,332
b)\(m_{Zn}=0,332\cdot65=21,58g\)
\(m_{HCl}=0,664\cdot36,5=24,236g\)
\(m_{ZnCl_2}=0,332\cdot136=45,152g\)
c)\(3H_2+Fe_2O_3\rightarrow2Fe+3H_2O\)
0,332 0,221
\(m_{Fe}=0,221\cdot56=12,376g\)
\(n_{Zn}=\dfrac{13}{65}=0,2(mol)\\ a,Zn+2HCl\to ZnCl_2+H_2\\ \Rightarrow n_{H_2}=0,2(mol);n_{HCl}=0,4(mol)\\ b,m_{HCl}=0,4.36,5=14,6(g)\\ c,V_{H_2}=0,2.24,79=4,958(l)\)
Câu 1:
a, Zinc + Hydrochloric acid → Zinc chloride + Hydrogen
b, Theo ĐLBT KL, có: mZn + mHCl = mZnCl2 + mH2
⇒ mHCl = 40,8 + 0,6 - 19,5 = 21,9 (g)
Bài 2:
a, Dấu hiệu: Có chất mới xuất hiện (ZnCl2 và H2)
b, PT: Iron + Hydrochloric acid → Iron (II) chloride + hydrogen
c, Theo ĐLBT KL: mFe + mHCl = mFeCl2 + mH2
⇒ mH2 = 5,6 + 7,3 - 12,7 = 0,2 (g)
Bài 3:
a, PT: Magnesium + Oxygen → Magnesium oxide
b, mMg + mO2 = mMgO
c, Từ phần b, có: mO2 = 15 - 9 = 6 (g)
Bạn tham khảo nhé!
\(n_{Zn}=\dfrac{3,25}{65}=0,05\left(mol\right)\)
PTHH: Zn + 2HCl ---> ZnCl2 + H2
0,05-->0,1------>0,05--->0,05
FeO + H2 --to--> Fe + H2O
0,05------>0,05
=> \(\left\{{}\begin{matrix}m_{ZnCl_2}=0,05.136=6,8\left(g\right)\\V_{H_2}=0,05.24,79=1,2395\left(l\right)\\m_{Fe}=0,05.56=2,8\left(g\right)\end{matrix}\right.\)
\(n_{Zn}=\dfrac{3,25}{65}=0,05\left(mol\right)\\
pthh:Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,05 0,05 0,05
\(m_{ZnCl_2}=0,05.136=6,8\left(g\right)\\
V_{H_2}=0,05.24,79=1,2395l\)
\(FeO+H_2\underrightarrow{t^o}Fe+H_2O\)
0,05 0,05 0,05
\(m_{Fe}=0,05.56=2,8g\)
\(a,ĐLBTKL.có.trong.sgk.rồi.tự.học\)
\(b,PTHH:Zn+2HCl\rightarrow ZnCl_2+H_2\\ Áp.dụng.ĐLBTKL,ta.có:\\ m_{Zn}+m_{HCl}=m_{ZnCl_2}+m_{H_2}\\ m_{H_2}=m_{Zn}+m_{HCl}-m_{ZnCl_2}=6,5+7,3-13,6=0,2\left(g\right)\\ n_{H_2}=\dfrac{m}{M}=\dfrac{0,2}{2}=0,1\left(mol\right)\\ V_{H_2\left(đktc\right)}=n.22,4=0,1.22,4=2,24\left(l\right)\)
a) \(n_{Zn}=\dfrac{9,75}{65}=0,15\left(mol\right)\)
PTHH: Zn + 2HCl --> ZnCl2 + H2
0,15-->0,3------>0,15-->0,15
=> mHCl = 0,3.36,5 = 10,95 (g)
b)
mZnCl2 = 0,15.136 = 20,4 (g)
c)
PTHH: Fe2O3 + 3H2 --to--> 2Fe + 3H2O
0,05<---0,15------->0,1
=> mFe2O3 = 0,05.160 = 8 (g)
mFe = 0,1.56 = 5,6 (g)
a.b.\(n_{Zn}=\dfrac{m_{Zn}}{M_{Zn}}=\dfrac{9,75}{65}=0,15mol\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,15 0,3 0,15 0,15 ( mol )
\(m_{HCl}=n_{HCl}.M_{HCl}=0,3.36,5=10,95g\)
\(m_{ZnCl_2}=n_{ZnCl_2}.M_{ZnCl_2}=0,15.136-20,4g\)
c.\(Fe_2O_3+3H_2\rightarrow2Fe+3H_2O\)
0,05 0,15 0,1 ( mol )
\(m_{Fe_2O_3}=n_{Fe_2O_3}.M_{Fe_2O_3}=0,05.160=8g\)
\(m_{Fe}=n_{Fe}.M_{Fe}=0,1.56=5,6g\)
Đường $\xrightarrow{t^o}$ Than + Nước
Kẽm + Axit clohidric $\to$ Hidro + Kẽm clorua
Glucozo $\xrightarrow{men,t^o} Khí Cacbon đioxit + Etanol