Question 6
Gas LawsOn heating, under suitable conditions, 1 litre of a monoatomic gas, X, combines with 1½ litres of oxygen to form an oxide. What is the formula of the oxide?
- A.XO3
- B.X2O3
- C.X2O2
- D.XO2
- E.None of the above
Show the answer and explanation
Answer: A (XO3)
Explanation
By Avogadro's law, 1 mol of X atoms (monoatomic) reacts with 1.5 mol O2 = 3 mol O atoms, so X:O = 1:3 and the oxide is XO3.