Answer:

Explanation:
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In this case, we consider that at STP conditions (273 K and 1 atm) we know that the volume of 1 mole of a gas is 22.4 L, thereby, for 83.4 L, the resulting moles are:

This is a case in which we apply the Avogadro's law which relates the volume and the moles as a directly proportional relationship.
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Because elemental mercury is a liquid at a room temperature
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1016)(2.2<span> × </span>1010<span>) = A × </span>10B<span> A= B= Chemistry.</span>