Question

if 8.62 g of CuNO3 is dissolved in water to make a 0.750 M solutions, what is the volume of the solution in millimeters?

Answer 1

To calculate the volume of the CuNO3 solution, you need to convert the mass to moles using the molar mass. Then, use the concentration to calculate the volume. The final volume is 91.5 mL.

Step-by-step explanation:

The volume of the CuNO3 solution can be calculated using the formula: concentration = moles/volume. Rearranging the formula, we have volume = moles/concentration. First, we need to convert the mass of CuNO3 to moles using the molar mass. The molar mass of CuNO3 is 125.6 g/mol. So, the number of moles of CuNO3 is 8.62 g / 125.6 g/mol = 0.0686 mol. Then, we can calculate the volume using the concentration: volume = 0.0686 mol / 0.750 M = 0.0915 L. Finally, we convert the volume to millimeters: volume = 0.0915 L x 1000 mL/L = 91.5 mL.

Answer 2

91.6 mL

Step-by-step explanation:

Recall that n/v=M, where n is moles, L is volume in liters and M is molar.

Rewrite the equation for L:

n/L=M

n=ML

n/M=L

Next, recall that moles is calculated by adding the atomic masses of all of the elements:

Cu+N+3O=125.55 g/mol

Find moles:

8.62g*1mol/125.55g=0.0687 moles

Substitute:

0.0687moles/(0.750 moles/liter) = 0.0916 L

1L=1000mL, so 0.0916L= 91.6 mL.