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

Its formula mass is ##73.89## ##g*mol^-1##.

As you know this salt is commonly used to treat mania. The formula mass is simply the sum of the molar masses of the contributing atoms: i.e. ##(2xx6.94+12.011+3xx15.999)*g*mol^-1## ##=## ##??##