Question #f0b84

1 Answer
Oct 18, 2016

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.


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:

enter image source here

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#