HARDMCQ SINGLEIChO (Chemistry Olympiad)Physical ChemistryGaseous stateAchiever Section

Five grams each of the following gases at 87 °C and 750 mm pressure are taken. Which of them will have the least volume ?

A.HF

B.HCl

C.HBr

D.HI✓ Correct

Explanation

V n (Avogadro’s Law) V MW w 1 V MW Least Vol. >>highest MW MW of HF=20g/mol MW of HCl=36.46g/mol MW of HBr=80.91g/mol MW of HI=127.904g/mol Hence, MW of HI is highest, it will have the least volume.

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