Question

A solution consists of 42.00 g of CuSO4 dissolved in 200.0 mL of water. The molar mass of Cu is 63.55 g/mol, the molar mass of S is 32.07 g/mol, and the molar mass of O is 16.00 g/mol. What is the molar it’s of the solution? Show all your work

Answer 1

1.315 M

Step-by-step explanation:

First, you need to find the number of moles of CuSO4 in 42.00 g. The molar mass of CuSO4 is calculated by adding the molar masses of Cu, S and 4 O atoms: 63.55 g/mol + 32.07 g/mol + (4 x 16.00 g/mol) = 159.62 g/mol.

So, the number of moles of CuSO4 in 42.00 g is: (42.00 g) / (159.62 g/mol) = 0.263 mol.

Since molarity is defined as the number of moles of solute per liter of solution, we need to convert the volume of water from mL to L: (200 mL) x (1 L / 1000 mL) = 0.2 L.

Finally, we can calculate the molarity by dividing the number of moles by the volume in liters: (0.263 mol) / (0.2 L) = 1.315 M.

So, the molarity of this solution is 1.315 M.