Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a) \(n_{CO_2}=\dfrac{0,4958}{24,79}=0,02\left(mol\right);n_{HCl}=0,6.1=0,6\left(mol\right)\)
PTHH: \(CaCO_3+2HCl\rightarrow CaCl_2+CO_2+H_2O\)
0,02<------0,04<----0,02<-----0,02
\(\Rightarrow n_{HCl\left(p\text{ư}\right)}< n_{HCl\left(b\text{đ}\right)}\left(0,04< 0,6\right)\Rightarrow HCl\) dư, \(CaCO_3\) tan hết
\(\Rightarrow\left\{{}\begin{matrix}m_{CaCO_3}=0,02.100=2\left(g\right)\\m_{CaSO_4}=5-2=3\left(g\right)\end{matrix}\right.\)
b) dd sau phản ứng có: \(\left\{{}\begin{matrix}n_{HCl\left(d\text{ư}\right)}=0,6-0,04=0,56\left(mol\right)\\n_{CaCl_2}=0,02\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}C_{M\left(HCl\left(d\text{ư}\right)\right)}=\dfrac{0,56}{0,6}=\dfrac{14}{15}M\\C_{M\left(CaCl_2\right)}=\dfrac{0,02}{0,6}=\dfrac{1}{30}M\end{matrix}\right.\)
\(n_{Zn}=\dfrac{6.5}{65}=0.1\left(mol\right)\)
\(n_{HCl}=\dfrac{73\cdot36.5\%}{36.5}=0.73\left(mol\right)\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
\(1.............2\)
\(0.1.........0.73\)
\(LTL:\dfrac{0.1}{1}< \dfrac{0.73}{2}\rightarrow HCldư\)
\(V_{H_2}=0.1\cdot22.4=2.24\left(l\right)\)
\(m_{ZnCl_2}=0.1\cdot136=13.6\left(g\right)\)
\(m_{\text{dung dịch sau phản ứng}}=6.5+73-0.1\cdot2=79.3\left(g\right)\)
\(C\%_{ZnCl_2}=\dfrac{13.6}{79.3}\cdot100\%=17.15\%\)
\(C\%_{HCl\left(dư\right)}=\dfrac{\left(0.73-0.2\right)\cdot36.5}{79.3}\cdot100\%=25.4\%\)
---Chúc em học tốt------
lần sau bạn nhớ cho them NTK nha cho dễ nhìn mà tính
\(n_{Fe}=\dfrac{6,5}{56}=\dfrac{13}{112}mol\)
\(m_{CH_3COOH}=\dfrac{90\cdot20\%}{100\%}=18g\Rightarrow n_{CH_3COOH}=0,3mol\)
\(Fe+2CH_3COOH\rightarrow\left(CH_3COO\right)_2Fe+H_2\uparrow\)
\(\dfrac{13}{112}\) 0,3 0 0
\(\dfrac{13}{112}\) \(\dfrac{13}{56}\) \(\dfrac{13}{112}\) \(\dfrac{13}{112}\)
0 \(\dfrac{19}{280}\) \(\dfrac{13}{112}\) \(\dfrac{13}{112}\)
a)\(m_{\left(CH_3COO\right)_2Fe}=\dfrac{13}{112}\cdot174=20,2g\)
\(m_{H_2}=\dfrac{13}{112}\cdot2=\dfrac{13}{56}g\)
\(m_{dd\left(CH_3COO\right)_2Fe}=6,5+90-\dfrac{13}{56}=96,27g\)
\(C\%=\dfrac{20,2}{96,27}\cdot100\%=20,98\%\)
a) \(n_{CO_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)
PTHH: 2HCl + CaCO3 → CaCl2 + CO2 + H2O
Mol: 0,4 0,2 0,2
b) \(C\%_{ddHCl}=\dfrac{0,4.36,5.100\%}{100}=14,6\%\)
c) \(m_{CaCl_2}=0,2.101=20,2\left(g\right)\)
- Cả 2 chất trong hhA đều tác dụng được với dd HCl dư. Nhưng chỉ có Zn tác dụng với dd HCl dư mới sinh ra khí H2
\(n_{H_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\\ PTHH:\left(1\right)Zn+2HCl\rightarrow ZnCl_2+H_2\\ \left(2\right)ZnO+2HCl\rightarrow ZnCl_2+H_2O\\ TheoPTHH\left(1\right):n_{Zn}=n_{ZnCl_2\left(1\right)}=n_{H_2}=0,2\left(mol\right)\\ m_{ZnO}=m_{hhA}-m_{Zn}=21,1-65.0,2=8,1\left(g\right)\\ n_{ZnO}=\dfrac{8,1}{81}=0,1\left(mol\right)\\ n_{ZnCl_2\left(2\right)}=n_{ZnO}=0,1\left(mol\right)\\ n_{ZnCl_2\left(tổng\right)}=0,2+0,1=0,3\left(mol\right)\\ m_{ddB}=m_{hhA}+m_{ddHCl}-m_{H_2}=21,1+200-0,2.2=220,7\left(g\right)\\ C\%_{ddZnCl_2}=\dfrac{136.0,3}{220,7}.100\%\approx18,487\%\)
\(n_{H_2}=\dfrac{4,48}{22,4}=0,2mol\\ Zn+2HCl\rightarrow ZnCl_2+H_2\left(1\right)\\ n_{Zn}=n_{H_2}=n_{ZnCl_2\left(1\right)}=0,2mol\\ n_{ZnO}=\dfrac{21,1-0,2.65}{81}=0,1mol\\ ZnO+2HCl\rightarrow ZnCl_2+H_2O\left(2\right)\\ n_{ZnCl_2\left(2\right)}=n_{ZnO}=0,1mol\\ C_{\%B}=C_{\%ZnCl_2}=\dfrac{\left(0,2+0,1\right).136}{21,1+200-0,2.2}\cdot100\%=18,49\%\)
\(n_{HCl}=\dfrac{14,6\%.450}{36,5}=1,8\left(mol\right)\\ n_{Fe_2O_3}=\dfrac{32}{160}=0,2\left(mol\right)\\ Fe_2O_3+6HCl\rightarrow2FeCl_3+3H_2O\\ Vì:\dfrac{1,8}{6}>\dfrac{0,2}{1}\\ \Rightarrow HCldư\\ a.n_{FeCl_3}=0,2.2=0,4\left(mol\right)\\ m_{FeCl_3}=162,5.0,4=65\left(g\right)\\ b.n_{HCl\left(dư\right)}=1,8-6.0,2=0,6\left(mol\right)\\ m_{HCl\left(dư\right)}=0,6.36,5=21,9\left(g\right)\\ c.m_{ddsau}=32+450=482\left(g\right)\\ C\%_{ddHCl\left(dư\right)}=\dfrac{21,9}{482}.100\approx4,544\%\\ C\%_{ddFeCl_3}=\dfrac{65}{482}.100\approx13,485\%\)
\(n_{Fe2O3}=\dfrac{32}{160}=0,2\left(mol\right)\)
\(m_{ct}=\dfrac{14,6.450}{100}=65,7\left(g\right)\)
\(n_{HCl}=\dfrac{65,7}{36,5}=1,8\left(mol\right)\)
Pt : \(Fe_2O_3+6HCl\rightarrow2FeCl_3+3H_2O|\)
1 6 2 3
0,2 1,8 0,4
a) Lập tỉ số so sánh : \(\dfrac{0,2}{1}< \dfrac{1,8}{6}\)
⇒ Fe2O3 phản ứng hết , HCl dư
⇒ Tính toán dựa vào số mol của Fe2O3
\(n_{FeCl3}=\dfrac{0,2.2}{1}=0,4\left(mol\right)\)
⇒ \(m_{FeCl3}=0,4.162,5=65\left(g\right)\)
b) \(n_{HCl\left(dư\right)}=1,8-\left(0,2.6\right)=0,6\left(mol\right)\)
⇒ \(m_{HCl\left(dư\right)}=0,6.36,5=21,9\left(g\right)\)
c) \(m_{ddspu}=32+450=482\left(g\right)\)
\(C_{FeCl3}=\dfrac{65.100}{482}=13,48\)0/0
\(C_{HCl\left(dư\right)}=\dfrac{21,9.100}{482}=4,54\)0/0
Chúc bạn học tốt
PTHH: \(CaCO_3+2HCl\rightarrow CaCl_2+H_2O+CO_2\)
Bđ____0,05______0,2
Pư____0,05______0,1______0,05
Kt_____0_______0,1_______0,05
C/m sau pư: CaCO3 hết, HCl dư
\(n_{HCl}=0,2\left(mol\right)\)
\(m_{ddsaupư}=m_{CaCO_3}+m_{ddA}-m_{CO_2}=5+0,2.36,5+32,7-0,05.44=42,8\left(g\right)\)
\(m_{HCldư}=0,1.36,5=3,65\left(g\right)\)
\(\Rightarrow C\%ddHCl=\dfrac{3,65}{42,8}.100\%\approx8,5\%\)
\(C\%ddCaCl_2=\dfrac{0,05.111}{42,8}.100\%\approx12,97\%\)
nHCl= 4,48/22,4= 0,2(mol)
=> mHCl= 0,2.36,5= 7,3(g)
=> mddHCl= 32,7+7,3= 40(g)
PTHH: CaCO3 + 2 HCl -> CaCl2 + H2O + CO2
nCaCO3= 5/100= 0,05(mol)
Ta có: 0,2/2 > 0,05/1
=> HCl dư, CaCO3 hết, tính theo nCaCO3.
=> DD sau phản ứng gồm dd HCl (dư) và dd CaCl2
nCO2= nCaCl2= nCaCO3= 0,05 (mol)
nHCl(p.ứ)= 0,05.2= 0,1(mol)
=> nHCl(dư)= 0,2- 0,1= 0,1(mol)
=> mCaCl2= 111.0,05= 5,55(g)
mHCl(dư) = 0,1.36,5= 3,65(g)
mCO2= 0,05.44= 2,2(g)
mddsauphảnứng= 40+ 5 - 2,2= 42,8(g)
=> C%ddCaCl2= (5,55/42,8).100 \(\approx\) 12,967%
C%ddHCl(dư) = (3,65/42,8).100 \(\approx\)8,528%