Ammonia and hydrogen chloride gases are both pungent smelling in nature. Both the gases are released seperately from two opposite corners of the room. Which gas will reach first to a person sitting in the centre of the room ?
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Solution
Rate of diffusion ∝1√molecularmassofcompound
Thus larger the molecular mass, smaller would be the rate of diffusion.
∴,NH3 being light will reach first as compared to HCl being lighter one.