Question

10 grams of caco3 contains how many moles of oxygen

Answer 1

Dear student,

Sorry for the above answer. In the question its not specified whether it is oxygen atoms or oxygen molecules. So I assumed it to be oxygen atoms. Thats why answer I got is different from the answer in the book.

Now lets solve the question. Its asked to find no.of moles of oxygen in 10 grams of caco3.

Molar mass of CaCO3 = 40 + 12 + 16 x 3 = 100

Moles of CaCO3 in 10 gram of CaCO3 =

One mole of CaCO3 contain 3 mols of oxygen atoms or =1.5 moles of oxygen molecules. Since oxygen is diatomic.

That is one mole of CaCO3 contains 1.5 moles of Oxygen
0.1 moles of CaCO3 will contain = = 0.1 X 1.5 = 0.15 moles of Oxygen

Sorry for the mistake occured. (Also if not specified as atoms always consider oxygen as O2)