Question

What are the oxygen moles in 0.5 mol of CaCO3 ?

Answer 1

Dear Student,

◆ Answer -

1.5 moles of oxygen are present in 0.5 moles of CaCO3.

● Explanation -

One molecule of CaCO3 contains 3 atoms of O. So 1 mol of CaCO3 consists 3 moles of O atoms. Hence, 0.5 mol of CaCO3 contains 0.5×3 = 1.5 moles of O atoms.

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Answer 2

Moles of oxygen in 0.5 mol of CaCO3 is 1.5 mole.

The decomposition of calcium carbonate give us calcium oxide and oxygen gas. The reaction is :--

CaCO3(s) + heat------> CaO(s) + O2(g)

1 mole of CaCO3 gives 1 mole of CaO and 1 mole of oxygen.

Any substance has molecular mass in 1 mole so mass of 1 mole CaCO3 is 100 gram.

Contribution of oxygen in CaCO3 is 316 = 48 grams.

So 48/100 = 48%

Mass of 0.5 mole of CaCO3 is 50 grams

So it has 48% oxygen =48/100* 50 = 24  grams of oxygen.

Moles of oxygen = given mass/ molecular mass

Moles = 24/16 = 1.5 moles of oxygen.

Hence 0.5 mole of CaCO3 gives 1.5 moles of oxygen.