Question

Calculate the volume in liters of a 0.195M potassium dichromate solution that contains 100. g of potassium dichromate (K,Cr,O2). Be sure your answer has the correct number of significant digits. |L x s ?

Answer 1

Answer: The volume of solution is 1.74 L

Explanation:

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Given mass of potassium dichromate = 100 g

Molar mass of potassium dichromate = 294.185 g/mol

Putting values in above equation, we get:

$\text{Moles of potassium dichromate}=\frac{100g}{294.185g/mol}=0.34mol$

To calculate the volume of solution, we use the equation:

$\text{Molarity of the solution}=\frac{\text{Moles of solute}}{\text{Volume of solution (in L)}}$

We are given:

Molarity of solution = 0.195 M

Moles of potassium dichromate = 0.34 moles

Putting values in above equation, we get:

$0.195mol/L=\frac{0.34mol}{\text{Volume of solution}}\\\\\text{Volume of solution}=1.74L$

Hence, the volume of solution is 1.74 L