Question

Question #f0b84

Answer 1

Molarity of a solution is the proportion between number of mols of the solute and volume of solution: `c=n/V`. From mass of the solute, you can calculate the number of mols and then the volume.

Explanation:

To calculate the volume of solution containing a certain amount of solute, if we know the molarity of the solution we can use the following scheme:

In this case, as they give us the mass of solute we need molecular mass to know how many moles there in that amount of solute.

The molecular mass of `CuNO_3` is:

`M_r (CuNO_3)=A_r (Cu)+A_r (N)+3*A_r (O)=63.5+14+3*16=125.5 g*mol^{- 1}`

Then, we have:

`2.86 g (HNO_3) times {1 mol (HNO_3)}/{125.5 g*mol^{- 1}} times {1 L solution}/{0.830 mol (HNO_3)}=0.0275 L`