Answer: The mass of potassium benzoate is [tex]8.40\times 10^{-4}g[/tex]
Explanation:
To calculate the mass of solute, we use the equation used to calculate the molarity of solution:
[tex]\text{Molarity of the solution}=\frac{\text{Mass of solute}}{\text{Molar mass of solute}\times \text{Volume of solution (in L)}}[/tex]
We are given:
Molarity of solution = 0.120 M
Molar mass of potassium benzoate trihydrate = 214.26 g/mol
Volume of solution = 1.5 L
Putting values in above equation, we get:
[tex]0.120M=\frac{\text{Mass of potassium benzoate trihydrate}}{214.26\times 1.5}\\\\\text{Mass of potassium benzoate trihydrate}=\frac{0.120mol/L\times 1.5L}{214.26g/mol}=8.40\times 10^{-4}g[/tex]
Hence, the mass of potassium benzoate is [tex]8.40\times 10^{-4}g[/tex]
