How many atoms do mercury vapour molecules consist of, if the density of mercury vapour relative...

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How many atoms do mercury vapour molecules consist of, if the density of mercury vapour relative to air is \( 6.92 \) ? (Atomic mass of \( \mathrm{Hg}=200 \) ). The average molar mass of air is \( 29 \mathrm{~g} / \mathrm{mol} \).
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