Question

a solution is made by adding 15 g of sodium chloride into 150 g of water. what is the mass percentage of this sodium chloride in this solution? select the correct answer below: 9.09% 11.17% 9.83% 12.45%

Explanation:

Step1: Calculate the mass of the solution

The mass of the solution \(m_{solution}=m_{solute}+m_{solvent}\). Here, \(m_{solute} = 15\space g\) (mass of sodium chloride) and \(m_{solvent}=150\space g\) (mass of water). So, \(m_{solution}=15 + 150=165\space g\)

Step2: Calculate the mass - percentage of the solute

The formula for mass - percentage (\(w\)) is \(w=\frac{m_{solute}}{m_{solution}}\times100\%\). Substitute \(m_{solute} = 15\space g\) and \(m_{solution}=165\space g\) into the formula: \(w=\frac{15}{165}\times 100\%=\frac{1500}{165}\% \approx 9.09\%\)

Answer:

9.09%