How many atoms do mercury vapour molecules \( \mathrm{P} \) consist...

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How many atoms do mercury vapour molecules
\( \mathrm{P} \) consist of if the density of mercury vapour relative

W to air is 6.92? The average mass of air is 29 g per mole \( (\mathrm{Hg}=200) \).
(a) 1
(b) 2
(c) 4
(d) Infinite
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