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Đổi \(200ml=0,2l\)
Số mol của 5,85g NaCl là:
\(n_{NaCl}=\dfrac{m_{NaCl}}{M_{NaCl}}=\dfrac{5,85}{58,5}=0,1\left(mol\right)\)
Nồng độ mol của \(5,85g\) \(NaCl\) là:
\(C_MNaCl=\dfrac{n}{V}=\dfrac{0,1}{0,2}=0,5\left(M\right)\)
\(a,n_{NaCl}=\dfrac{5,85}{58,5}=0,1\left(mol\right)\\ C_{M\left(NaCl\right)}=\dfrac{0,1}{0,3}=\dfrac{1}{3}M\\ b,n_{CuSO_4}=\dfrac{300}{160}=1,875\left(mol\right)\\ C_{M\left(CuSO_4\right)}=\dfrac{1,875}{0,3}=6,25M\)
1 ) nZn = 12/65= 0.18(mol)
Zn+ 2HCl → ZnCl2+ H2
0.18 → 0.36
→ CMHCl = 0.36/ 0.2 = 1.8M
2) nCuO = 8/80=0.1(mol)
nHCl = 1 x 0.1 = 0.1 (mol)
CuO + 2HCl → CuCl2 + H2O
ban đầu : 0.1: 0.1
p/ứ: 0.05← 0.1 → 0.05
sau p/ứ: 0.05: 0: 0.05
mCuO = 0.05 x 80 = 4(g)
m CuCl2 = 0.05 x 135 = 6.75(g)
Câu 1:
nZn = \(\frac{12}{65}= 0,18\) mol
Pt: Zn + ...2HCl --> ZnCl2 + H2
0,18 mol-> 0,36 mol
CM dd HCl = \(\frac{0,36}{0,2}= 1,8M\)
Cả 2 đều 0,1M?
\(n_{Na^+}=0,1.0,1+2.0,1.0,1=0,03\left(mol\right)\)
\(\Rightarrow\left[Na^+\right]=\dfrac{0,03}{0,1}=0,3M\)
\(n_{Cl^-}=0,1.0,1=0,01\left(mol\right)\Rightarrow\left[Cl^-\right]=0,1M\)
\(n_{SO_4^{2-}}=0,1.0,1=0,01\left(mol\right)\Rightarrow\left[SO_4^{2-}\right]=0,1M\)
\(a,C\%_{NaCl}=\dfrac{15}{15+185}.100\%=7,5\%\\ b,m_{HNO_3}=\dfrac{18,9}{100}.100+\dfrac{6,3}{100}.200=31,5\left(g\right)\\ m_{ddHNO_3}=100+200=300\left(g\right)\\ C\%_{HNO_3}=\dfrac{31,5}{300}.100\%=10,5\%\)
\(c,n_{NaCl}=\dfrac{5,85}{58,5}=0,1\left(mol\right)\\ C_{M\left(NaCl\right)}=\dfrac{0,1}{0,1}=1M\\ d,n_{KOH}=2.0,2+0,2.0,2=0,44\left(mol\right)\\ V_{ddKOH}=0,2+0,2=0,4\left(l\right)\\ C_{M\left(KOH\right)}=\dfrac{0,44}{0,4}=1,1M\\ e,m_{NaOH}=\dfrac{150.16}{100}=24\left(g\right)\\ m_{ddNaOH}=50+150=200\left(g\right)\\ C\%_{NaOH}=\dfrac{24}{200}.100\%=12\%\)
\(n_{NaCl}=0.1\cdot0.1=0.01\left(mol\right)\)
\(n_{AgNO_3}=0.15\cdot0.1=0.015\left(mol\right)\)
\(NaCl+AgNO_3\rightarrow NaNO_3+AgCl\)
\(0.01..........0.01...............0.01\)
Dung dịch : 0.01 (mol) NaNO3 , 0.005 (mol) AgNO3
\(\left[Na^+\right]=\dfrac{0.01}{0.1+0.15}=0.04\left(M\right)\)
\(\left[Ag^+\right]=\dfrac{0.005}{0.25}=0.02\left(M\right)\)
\(\left[NO_3^-\right]=\dfrac{0.01+0.005}{0.25}=0.06\left(M\right)\)
Câu 1:
\(n_{NaCl}=\dfrac{5,85}{58,5}=0,1\left(mol\right)\Rightarrow C_{M_{ddNaCl}}=\dfrac{0,1}{0,1}=1M\)
\(n_{KOH}=\dfrac{5,6}{56}=0,1\left(mol\right)\Rightarrow C_{M_{ddKOH}}=\dfrac{0,1}{0,1}=1M\)
\(n_{CaCl_2}=\dfrac{11,1}{111}=0,1\left(mol\right)\Rightarrow C_{M_{ddCaCl_2}}=\dfrac{0,1}{0,1}=1M\)
Câu 2:
a,\(n_{Ba\left(OH\right)_2}=0,2.1,5=0,3\left(mol\right)\)
b,\(C\%_{ddHCl}=\dfrac{0,2.36,5.100\%}{200}=3,65\%\)
\(C\%_{ddH_2SO_4}=\dfrac{0,1.98.100\%}{200}=4,9\%\)