Question

Water is evaporated from 135mL of 0.224 M MgSO4 solution until the solution volume become 105 ml . what is the molarity of MgSO4 in the solution that result

Answer 1

Answer:

Explanation:

We have  $2.3 * 10^{-4}$ moles of MgSo4

We know the molarity and the volume of solution. However, the volume does not have the proper units since it is given in terms of milliliters instead of liters. We can convert 4.5 mL into liters by using the conversion factor 1000mL = 1L.

When 4.5 mL is divided by 1000 mL/L, we obtain a volume of 0.0045 L.

Now we can rearrange the equation to solve for the number of moles. This can be accomplished by multiplying by liters of solution on both sides of the equation. The liters of solution will cancel out on the right side, leaving the number of moles being equal to the molarity times volume like so:

Moles of solute =  liters of solution  × Molarity

Moles of solute = 0.0045 L * 0.05 M

Hope it helps!

Please mark it as Brainliest !!