A beaker contains 42.2 mL of pentane (C5H12 density is 0.626 g/mL). Determine how many C atoms this liquid contains

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.

answer by yourhope:

how do models compare to real-world objects?

d. most models represent a real-world object in a simpler way.

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