The molecular formula of lithium carbonate is Li2CO3. What is the molecular weight of this compound?

The molecular formula of lithium carbonate is actually Li2CO3, not Li2C03 as mentioned in your question.

To calculate the molecular weight of lithium carbonate (Li2CO3), you can sum the atomic weights of all the atoms in the molecule. Here are the atomic weights of the elements in the formula:

Lithium (Li) has an atomic weight of approximately 6.94.
Carbon (C) has an atomic weight of approximately 12.01.
Oxygen (O) has an atomic weight of approximately 16.00.
Now, calculate the molecular weight:

Molecular Weight of Li2CO3 = (2 * Atomic Weight of Li) + (1 * Atomic Weight of C) + (3 * Atomic Weight of O)
Molecular Weight of Li2CO3 = (2 * 6.94) + (1 * 12.01) + (3 * 16.00)
Molecular Weight of Li2CO3 ≈ 13.88 + 12.01 + 48.00 ≈ 73.89 g/mol

So, the molecular weight of lithium carbonate (Li2CO3) is approximately 73.89 grams per mole (g/mol).