molecular formula of lithium carbonate is LiCO.What is the molecular weight of the drug?

Question

a. 100.88
b. 73.88
c.48
d. 6.94

Answer 1

just look up the atomic weights of the elements and add them up.

since O=16 and C=12, CO3 = 60, and Li is lighter than C, so (b) is the only possible choice.