9.2 g hh Mg CaCO3 td dd hcl 7.3% thu đc hh khí y và dd z biết DY/h2=8.875 @%m mg và caco3 C% ddy 01/11/2021 Bởi Daisy 9.2 g hh Mg CaCO3 td dd hcl 7.3% thu đc hh khí y và dd z biết DY/h2=8.875 @%m mg và caco3 C% ddy
Giải thích các bước giải: \(\begin{array}{l}Mg + 2HCl \to MgC{l_2} + {H_2}\\CaC{O_3} + 2HCl \to CaC{l_2} + C{O_2} + {H_2}O\\{M_y} = 17,75\\\dfrac{{{n_{C{O_2}}}}}{{{n_{{H_2}}}}} = \dfrac{{17,75 – 2}}{{44 – 17,75}} = \dfrac{3}{5}\\{n_{CaC{O_3}}} = {n_{C{O_2}}} = \dfrac{3}{5}{n_{{H_2}}}\\{n_{{H_2}}} = {n_{Mg}}\\24 \times {n_{Mg}} + 100 \times \dfrac{3}{5}{n_{Mg}} = 9,2 \to {n_{Mg}} = 0,11mol{n_{CaC{O_3}}} = 0,0656mol\\\% {m_{Mg}} = \dfrac{{0,11 \times 24}}{{9,2}} \times 100\% = 28,70\% \\\% {m_{CaC{O_3}}} = 71,30\% \\{m_{HCl{\rm{dd}}}} = \dfrac{{2 \times (0,11 + 0,0656) \times 36,5 \times 100}}{{7,3}} = 175,6g\\{m_{{\rm{dd}}}} = 9,2 + 175,6 – {m_{C{O_2}}} – {m_{{H_2}}} = 181,6936g\\C{\% _{MgC{l_2}}} = \dfrac{{0,11 \times 95}}{{181,6936}} \times 100\% = 5,75\% \\C{\% _{CaC{l_2}}} = \dfrac{{0,0656 \times 100}}{{181,6936}} \times 100\% = 3,61\% \end{array}\) Bình luận
Giải thích các bước giải:
\(\begin{array}{l}
Mg + 2HCl \to MgC{l_2} + {H_2}\\
CaC{O_3} + 2HCl \to CaC{l_2} + C{O_2} + {H_2}O\\
{M_y} = 17,75\\
\dfrac{{{n_{C{O_2}}}}}{{{n_{{H_2}}}}} = \dfrac{{17,75 – 2}}{{44 – 17,75}} = \dfrac{3}{5}\\
{n_{CaC{O_3}}} = {n_{C{O_2}}} = \dfrac{3}{5}{n_{{H_2}}}\\
{n_{{H_2}}} = {n_{Mg}}\\
24 \times {n_{Mg}} + 100 \times \dfrac{3}{5}{n_{Mg}} = 9,2 \to {n_{Mg}} = 0,11mol{n_{CaC{O_3}}} = 0,0656mol\\
\% {m_{Mg}} = \dfrac{{0,11 \times 24}}{{9,2}} \times 100\% = 28,70\% \\
\% {m_{CaC{O_3}}} = 71,30\% \\
{m_{HCl{\rm{dd}}}} = \dfrac{{2 \times (0,11 + 0,0656) \times 36,5 \times 100}}{{7,3}} = 175,6g\\
{m_{{\rm{dd}}}} = 9,2 + 175,6 – {m_{C{O_2}}} – {m_{{H_2}}} = 181,6936g\\
C{\% _{MgC{l_2}}} = \dfrac{{0,11 \times 95}}{{181,6936}} \times 100\% = 5,75\% \\
C{\% _{CaC{l_2}}} = \dfrac{{0,0656 \times 100}}{{181,6936}} \times 100\% = 3,61\%
\end{array}\)