5. (10 Points) Chlorine gas is in a container that has a volume of 25.0 mL at 40°C. What volume will it occupy at 80°C?
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it had to transfer to a care and maintenance mode

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.

that's what i got you can count the number of atoms