Question

A solution is prepared by dissolving 98.6 g of NaCl in enough water to form 875 mL of solution. Calculate the mass % of the solution if the density of the solution is 1.06 g/mL.11.3%11.9%12.7%9.4%10.6%

Answer 1

Mass percent is given by:

`mass\%=\frac{mass\text{ }solute}{moass\text{ }of\text{ }solution}*100`

We will firstly use the desnity to calculate the mass of the solution:

`\begin{gathered} \rho=(mass)/(volume) \\ \rho:density \\ 1.06\text{ }gmL^(-1)=\frac{mass}{875\text{ }mL} \\ \\ mass=875\text{ }mL*1.06\text{ }gmL^(-1) \\ mass(solution)=927.5g \end{gathered}`

Now that we have the mass of the solution we are able to calculate the mass percent:

`\begin{gathered} mass\%=(98.6g)/(927.5g)*100 \\ \\ mass\%=10.6\% \end{gathered}`

Answer: Mass percent is 10.6%