Question

Tính số gam của dd NaCl khi cho 0,1 mol NaCl vào nước tạo ra dd NaCl 10%

Answer 1

\(m_{NaCl}=0,1.58,5=5,85\left(g\right)\\ m_{\text{dd}NaCl}=\dfrac{5,85.100}{10}=58,5\left(g\right)\)

Answer 2

\(m_{NaCl}=0,1.58,5=5,85\left(g\right)\)

\(C\%_{NaCl}=\dfrac{m_{NaCl}}{m_{dd}}.100\)

\(\Leftrightarrow10=\dfrac{5,85}{m_{dd}}.100\)

\(\Rightarrow m_{dd}=\dfrac{5,85.100}{10}=58,5\left(g\right)\)