Giải thích các bước giải:
a,
\(\begin{array}{l}
{m_{Ca{{(OH)}_2}}} = 7,4g\\
{m_{{\rm{dd}}}} = 7,4 + 20 = 27,4g
\end{array}\)
b,
\(\begin{array}{l}
{m_{HCl}} = 7,3g\\
{m_{{\rm{dd}}}} = 7,3 + 20 = 27,3g
\end{array}\)
c,
\(\begin{array}{l}
{m_{{C_2}{H_5}OH}} = 20g\\
{m_{{\rm{dd}}}} = 20 + 80 = 100g
\end{array}\)
d,
\(\begin{array}{l}
{m_{{K_2}O}} = 9,4g\\
{m_{{\rm{dd}}}} = 9,4 + 90 = 99,4g
\end{array}\)
e,
\(\begin{array}{l}
{m_{Zn}} = 6,5g\\
{m_{{\rm{dd}}}} = 6,5 + 70 - 0,1 \times 2 = 76,3g
\end{array}\)
