Question

no.of moles of oxygen in 0.2 moles of CaCO3​

Answer 1

Answer:

0.2 moles of CaCO3 gives 0.6 moles of oxygen.

Explanation:

Moles of oxygen in 0.2 mol of CaCO3 is 0.6 moles.

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 grams.

Contribution of oxygen in CaCO3 is 316 = 48 grams.

So (48*100)/100 = 48%

Mass of 0.2 moles of CaCO3 = 0.2*100 = 20 grams

So it has 48% oxygen = (20*48)/100 = 9.6  grams of oxygen.

Moles of oxygen = given mass/ molecular mass

Moles = 9.6/16 = 0.6 moles of oxygen.

Hence 0.2 moles of CaCO3 gives 0.6 moles of oxygen.