a, PT: \(MgCl_2+2NaOH\rightarrow Mg\left(OH\right)_{2\downarrow}+2NaCl\)
\(Mg\left(OH\right)_2\underrightarrow{t^o}MgO+H_2O\)
b, Ta có: \(n_{MgCl_2}=0,2.0,15=0,03\left(mol\right)\)
Theo PT: \(n_{MgO}=n_{Mg\left(OH\right)_2}=n_{MgCl_2}=0,03\left(mol\right)\)
\(\Rightarrow m_{MgO}=0,03.40=1,2\left(g\right)\)
c, Theo PT: \(n_{NaCl}=2n_{MgCl_2}=0,06\left(mol\right)\)
\(\Rightarrow C_{M_{MgCl_2}}=\dfrac{0,06}{0,3}=0,2\left(M\right)\)
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