By which method the molecular mass of benzene was determined as 78.108 ?
Correct answer: B. Vapour density method
- A. Specific gravity method
- B. Vapour density method
- C. X-ray diffraction method
- D. Distillation methos
Explanation
Vapour density is related to molecular mass by molecular mass = 2 x vapour density when the vapour is measured relative to hydrogen. Thus a vapour density of 39.054 gives 2 x 39.054 = 78.108 g mol-1 for benzene. The likely mistake is choosing specific gravity, which compares densities of substances and is not the standard direct method for vapour molecular mass.
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About Benzene and Aromatic Compounds
Benzene has a planar ring of delocalised π electrons, giving aromatic stability and equal carbon-carbon bond lengths. The topic covers resonance, electrophilic substitution reactions such as nitration, halogenation, sulphonation and Friedel-Crafts reactions, along with substituent effects and the distinction between substitution in benzene and addition in ordinary alkenes.
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