Mole Concept Test - 2

But 1 mole of CO and 1 mole of O₂ are present. Now 1 mole of O₂ requires 2 moles of CO to react and 1 mole of CO requires 0.5 moles of O₂ to react. 2 moles of CO are not present but 0.5 moles of O₂ are present.

Therefore, 1 mole of CO will react with 0.5 moles of O₂ to form 1 mole of CO₂. 0.5 moles of O₂ will remain unreacted. In this reaction, CO is the limiting reagent because it limits the quantity of the product formed.

Finally the total moles present are 0.5 (moles of O₂) + 1 (mole of CO₂) = 1.5.

Molecular weight of heavy water used as a moderator in nuclear reactors is 20 g.

The molecular mass of AI₂(SO₄)₃ is 342 g.

The molecular weight of CaCO₃ is 40.0 + 12.0 + 3(16.0) = 100 g/mol.

The molar mass of ammonium sulphate is 132 g/mol.

The molecular mass of Cl₂ is 70.90 u.

Air is made up of 78 percent nitrogen, just under 21 percent oxygen and the rest is water vapour, CO₂ and small concentrations of noble gases such as neon and argon.

If a compound of nitrogen and oxygen, on analysis, shows that it contains 28 g of nitrogen for every 32 g of oxygen, it forms a compound with the formula N₂O₂.