Em tham khảo nha :
\(\begin{array}{l}
8)\\
{H_2}S{O_4}\,10\% :\\
{m_{{H_2}S{O_4}(1)}} = \dfrac{{100 \times 10}}{{100}} = 10g\\
{H_2}S{O_4}\,30\% :\\
C\% = \dfrac{{{m_{{H_2}S{O_4}(1)}} + {m_{{H_2}S{O_4}(2)}}}}{{100 + 200}} \times 100\% = 30\% \\
\Rightarrow \dfrac{{{m_{{H_2}S{O_4}(2)}} + 10}}{{300}} = 0,3\\
\Rightarrow {m_{{H_2}S{O_4}(2)}} = 80g\\
C{\% _{{H_2}S{O_4}(2)}} = \dfrac{{80}}{{200}} \times 100\% = 40\% \\
9)\\
D = \dfrac{{{m_{dd}}}}{V}\\
{C_M} = \frac{n}{V}\\
C\% = \dfrac{{{m_{ct}}}}{{{m_{dd}}}} \times 100\% = \dfrac{{n \times M}}{{D \times V}} \times 100\% = \dfrac{{{C_M} \times M}}{D} \times 100\% \\
{C_M} = \dfrac{{C\% \times D \times 10}}{M}\\
10)\\
{C_M} = \dfrac{{15 \times 1,1 \times 10}}{{58,5}} = 2,82M
\end{array}\)
