1.

Calculate the mass percentage of oxygen in CaCO3 .

Answer»

Molecular mass of CaCO3 = 100 g mol-1 

Mass of oxygen in 100 g CaCO3 

=3 × 16 g = 48 g 

Percentage of oxygen in CaCO3 

\(\frac{48}{100}\times 100\) = 48%



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