The answer would be kilograms. Otherwise Liters measure volume, Newton's measure force and Meters measure distance.
Hope this helps!
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The volume of I- is missing in your question by assuming it = 1L
moles I- = molarity * volume
= 0.00237 * 1 L
= 0.00237 mol
[I-] = moles / total volume
= 0.00237 / 1.625L
= 0.00146 M
moles Pb2+ = molarity * volume
= 0.00785 * 0.625 L
= 0.0049 mol
[Pb2+] = 0.0049 / 1.625L
= 0.003 M
when PbI2(s) ↔ Pb2+(aq) + 2I-(aq)
when Q = [Pb2+][I-]^2 and we neglect [PbI2] as it is solid
∴ Q = 0.003 * (0.00146)^2
= 6.4 x 10^-9
by comparing the value of Q with Ksp value we will found that:
Q < Ksp which mean that more solid will dissolve, and this is an unsaturated solution which has ion concentrations < equilibrium concentrations, so the reaction will go forward until achieving equilibrium.