How many moles are equal to 2.4 x 10 23 formula units of sodium chloride?

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.

we need the questions , i may then you.

it's c (engineer's do their work with mechanical stuff not on any living being)

the correct answer would be b. amelia, because the particals of gas move really fast (charged particals) and gas also has a lot of room (particals move independently) so the only answer that has both of those is amelia's.