MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Physical ChemistryMole _ Equivalent ConceptPrevious Year Questions

Volume of a gas at NTP is 1.12×10–7 cm3. The number of molecules in it is (Manipal 2010)

A.3.01×1012✓ Correct

B.3.01×1024

C.3.01×1023

D.3.01×1020

Explanation

Given, The volume of gas at NTP = 7 3 7 1.12 10 1.12 10 cm mL x x The volume of Number of molecules gas at NTP present 22400 mL 23 6.022 10 A N x (one mole) 7 1.12 10 mL x x Solving for x, we get 23 7 16 12 6.022 10 1.12 10 22400 0.0003011 10 molecules 3.011 10 molecules x x x x x x

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