Answer : The volume of new solution is, 1.65 liter
Solution : 
According to the dilution, 
 
 
where, 
 = molarity of magnesium nitrate solution = 2.13 M
 = molarity of magnesium nitrate solution = 2.13 M 
 = volume of magnesium nitrate solution = 1.24 L
 = volume of magnesium nitrate solution = 1.24 L
 = molarity of new solution = 1.60 M
 = molarity of new solution = 1.60 M 
 = volume of new solution = ?
 = volume of new solution = ?
Now put all the given values in the above law, we get the volume of new solution. 
 
 
 
 
Therefore, the volume of new solution is, 1.65 liter