PTHH: \(R+2HCl\rightarrow RCl_2+H_2\)
\(HCl+NaOH\rightarrow NaCl+H_2O\)
\(RCl_2+2NaOH\rightarrow R\left(OH\right)_2+2NaCl\)
\(R\left(OH\right)_2\underrightarrow{t^o}RO+H_2O\)
\(n_{NaOH}=\dfrac{64.12,5\%}{40}=0,2\left(mol\right)\)
Theo PTHH: nNaCl = nNaOH = 0,2 (mol)
=> mNaCl = 0,2.58,5 = 11,7 (g)
=> \(m_Y=\dfrac{11,7.100}{4,68}=250\left(g\right)\)
=> \(m_{RCl_2}=\dfrac{250.13,3}{100}=33,25\left(g\right)\)
Theo PTHH: \(n_{RCl_2}=n_{RO}\)
=> \(\dfrac{33,25}{M_R+71}=\dfrac{14}{M_R+16}\Rightarrow M_R=24\left(g/mol\right)\)
=> R là Magiê
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