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\(a.MgO+2HCl\rightarrow MgCl_2+H_2O\)
\(b.n_{MgO}=\dfrac{16}{40}=0,04mol\)
\(\rightarrow n_{HCl}=0,04.2=0,08mol\)
\(C_{M_{HCl}}=\dfrac{0,08}{0,15}=0,53M\)
\(c.m_{MgCl_2}=0,04.95=3,8g\)
\(n_{CuCl_2}=\dfrac{60,75}{135}=0,45mol\\ a)CuCl_2+2NaOH\rightarrow Cu\left(OH\right)_2+2NaCl\)
0,45 0,9 0,45 0,9
\(b)m_X=m_{Cu\left(OH\right)_2}=0,45.81=36,45g\\
c)m_{ddNaOH}=\dfrac{0,9.40}{15\%}\cdot100\%=240g\\
d)m_{ddNaCl}=60,75+240-36,45=264,3g\\
C_{\%NaCl}=\dfrac{0,9.58,5}{264,3}\cdot100\%=19,92\%\\
e)n_{H_2SO_4}=\dfrac{245.20\%}{100\%.98}=0,5mol\\
H_2SO_4+Cu\left(OH\right)_2\rightarrow CuSO_4+2H_2O\\
\Rightarrow\dfrac{0,5}{1}>\dfrac{0,45}{1}\Rightarrow H_2SO_4.dư\)
\(\Rightarrow\)Dung dịch acid \(H_2SO_4\) làm tan hết chất X\(\left(Cu\left(OH\right)_2\right)\)
\(n_{Fe_2O_3}=\dfrac{8}{160}=0,05\left(mol\right)\)
PTHH: Fe2O3 + 3H2SO4 --> Fe2(SO4)3 + 3H2O
______0,05------>0,15--------->0,05
=> mH2SO4 = 0,15.98 = 14,7(g)
=> \(C\%\left(H_2SO_4\right)=\dfrac{14,7}{100}.100\%=14,7\%\)
\(C\%\left(Fe_2\left(SO_4\right)_3\right)=\dfrac{0,05.400}{8+100}.100\%=18,52\%\)
PTHH: Fe2(SO4)3 + 6NaOH --> 2Fe(OH)3\(\downarrow\) + 3Na2SO4
________0,05----------------------->0,1
=> mFe(OH)3 = 0,1.107=10,7(g)
250ml=0,25l
\(MgO+2HCl\rightarrow MgCl_2+H_2O\)
0.2.........0.4..........0,2............0,2 (mol)
a)
\(n_{MgO}=\dfrac{8}{40}=0,2\left(mol\right)\)
\(m_{MgCl_2}=0,2.95=19\left(g\right)\)
b)
\(C_{M_{HCl}}=\dfrac{0,4}{0,25}=1,6\left(M\right)\)
a/ \(n_{MgO}=\dfrac{8}{40}=0,2\left(mol\right)\)
PTHH: MgO + 2HCl → MgCl2 + H2O
Mol: 0,2 0,4 0,2
\(m_{MgCl_2}=0,2.95=19\left(g\right)\)
b/ \(C_{M_{ddHCl}}=\dfrac{0,4}{0,25}=1,6M\)
a, \(CuCl_2+2NaOH\rightarrow2NaCl+Cu\left(OH\right)_2\)
b, \(n_{NaOH}=\dfrac{10}{40}=0,25\left(mol\right)\)
Theo PT: \(n_{CuCl_2}=n_{Cu\left(OH\right)_2}=\dfrac{1}{2}n_{NaOH}=0,125\left(mol\right)\)
\(\Rightarrow m_{Cu\left(OH\right)_2}=0,125.98=12,25\left(g\right)\)
c, \(C_{M_{CuCl_2}}=\dfrac{0,125}{0,1}=1,25\left(M\right)\)
\(n_{NaOH}=\dfrac{10}{40}=0,25\left(mol\right)\)
PTHH:
\(CuCl_2+2NaOH\rightarrow Cu\left(OH\right)_2+2NaCl\)
0,125 0,25 0,125 0,25
\(m_{Cu\left(OH\right)_2}=0,125.98=12,25\left(g\right)\)
\(C_{M\left(CuCl_2\right)}=\dfrac{0,125}{0,1}=1,25\left(M\right)\)
\(a.\) \(2HNO_3+Ba\left(OH\right)_2\rightarrow Ba\left(NO_3\right)_2+2H_2O\)
\(b.\) \(n_{Ba\left(OH\right)_2}=C_M.V_{dd}=0,15.0,2=0,03mol\)
\(m_{Ba\left(NO_3\right)_2}=0,03.261=7,83g\)
\(c.\)\(n_{HNO_3}=0,03.2=0,06mol\)
\(V_{dd_{HNO_3}}=\dfrac{n}{C_M}=\dfrac{0,06}{1,2}=0,05l\)
\(d.\)\(V_{dd_{spu}}=0,05+0,15=0,2l\)
\(C_{M_{Ba\left(NO_3\right)_2}}=\dfrac{n}{V_{dd}}=\dfrac{0,03}{0,2}=0,15M\)