How To calculate molar concentration?

[imapeiceofwod]

A 40 ml volume of iron nitrate (1.8M) is mixed with 21.5ml of iron nitrate (0.808M) calculate the molar concentration of the final solution.

what would be the steps to solve this problem. I am assuming i have to find the number of moles of each given the data but from there I am unsure.

 

[Borek]

Total number of moles in total volume.

Note that total volume can be calculated only in an approximated way, as - in general - volumes are not additive. Difference is usually negligible, but it does exist.