1- Calculate the splitting energy of [Co (NO2) 6] -3 since 364 nm has a single band?

Question

2- 420 micro Siemens value is read in the conductivity device for the complex prepared at the concentration of 1.10-3 M. Calculate the number of ions of the complex?

3- You are asked to prepare 1.10-3 M 15 mL Potassium tri oxalato chromate (III) solution for conductivity measurement studies. Describe the preparation of the solution by making the necessary calculations?

Answer 1

Do you have choices for answers to these?
On #3 is that 1E-3 or 1 x 10^-3 or something different?

Answer 2

In the question 3 (1×10^-3)
Please i need help