molecular formula of lithium carbonate is LiCO.What is the molecular weight of the drug?
a. 100.88
b. 73.88
c.48
d. 6.94
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.
To calculate the molecular weight of a compound like lithium carbonate (LiCO), you need to find the atomic masses of each element and multiply them by the number of atoms in the compound.
The atomic mass of lithium (Li) is 6.94 grams/mole.
The atomic mass of carbon (C) is 12.01 grams/mole.
The atomic mass of oxygen (O) is 16.00 grams/mole.
In lithium carbonate (LiCO), there is one lithium atom (Li), one carbon atom (C), and three oxygen atoms (O).
So, to calculate the molecular weight, you add up the atomic masses of each element:
Molecular weight = (1 x atomic mass of Li) + (1 x atomic mass of C) + (3 x atomic mass of O)
Molecular weight = (1 x 6.94) + (1 x 12.01) + (3 x 16.00)
Molecular weight = 6.94 + 12.01 + 48.00
Molecular weight = 66.95 grams/mole
Therefore, the correct answer is not among the options provided. The molecular weight of lithium carbonate (LiCO) is approximately 66.95 grams/mole.