MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Physical ChemistryMole _ Equivalent ConceptAtomic and Molecular Masses

Which of the following gases will have the least volume if 10 g of each gas is taken at same temperature and pressure?

A.CO₂✓ Correct

B.N₂

C.CH₄

D.HCl

Explanation

Avogadro’s Law states that under same conditions of temperature and pressure, volume of gases (V) is proporitional to the amount of gases in moles(n). V n mass molar mass n Mass of gases are same = 10g 1 Molar mass V Molar mass of 2 12 2 16 44 CO g x Molar mass of 2 2 14 28 N g x Molar mass of 4 12 4 1 16 CH g x Molar mass of HCl 1 35.5 36.5g Order of volume of 10 g of given gases is: 4 2 2 CH N HCl CO

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