a) \(n_{CO_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)
PTHH: A2CO3 + 2HCl --> 2ACl + CO2 + H2O
_____0,1<---------------------------0,1
=> \(M_{A_2CO_3}=\dfrac{10,6}{0,1}=106\left(g/mol\right)\)
=> MA = 23 (g/mol)
=> A là Na
b) \(n_{HCl}=\dfrac{400.3,65}{100.36,5}=0,4\left(mol\right)\)
PTHH: Na2CO3 + 2HCl --> 2NaCl + CO2 + H2O
_______0,1---->0,2-------->0,2----->0,1
=> mHCl (dư) = (0,4-0,2).36,5 = 7,3 (g)
=> mNaCl = 0,2.58,5 = 11,7(g)
mdd sau pư = 10,6 + 400 - 0,1.44 = 406,2 (g)
\(\left\{{}\begin{matrix}C\%\left(NaCl\right)=\dfrac{11,7}{406,2}.100\%=2,88\%\\C\%\left(HCl\right)=\dfrac{7,3}{406,2}.100\%=1,8\%\end{matrix}\right.\)
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