Question

If 4.7M SrLi2 solution is diluted to 45L, what is the molarity of the diluted solution?

Answer 1

Sr WHAT?
How much of that Sr whatever was used.
mL1 x M1 = mL2 x M2

Answer 2

It is SrCl2 not SrLi2

Answer 3

That equation will tell you how to dilute it. But you still must have the amount of the SrCl2 used. Let's say you used 100 mL, then
100mL x 4.7M = 45000 mL x M
Solve for M of the 45 L material.