How many millimoles of solute are contained in 250 ml of a solution that contains 4.20 ppm of CuSO4?

Question

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1 point
0.00658 mmol
10.0 mmol
6.58 mmol
0.0658 mmol

Answer 1

6.58 mmol

To calculate the millimoles of solute in a solution with ppm, you can use the following formula:

millimoles = (ppm * volume) / MW

Where:
ppm = parts per million (4.20 ppm)
volume = volume of solution in mL (250 ml)
MW = molecular weight of the solute

The molecular weight of CuSO4 can be calculated as follows:
Cu = 63.55 g/mol
S = 32.07 g/mol
O = 16.00 g/mol
MW = 63.55 + 32.07 + (4 * 16.00)
MW = 159.61 g/mol

Now, plug the values into the formula:
millimoles = (4.20 * 250) / 159.61
millimoles = 1050 / 159.61
millimoles ≈ 6.58 mmol

Therefore, there are approximately 6.58 mmol of solute (CuSO4) in 250 ml of the solution.