The image above shows a chamber with a fixed volume filled with gas
at a pressure of 1560 mmHg and a temperature of 445.0 5. If the
temperature drops to 312.0 K, what is the new pressure of the gas in
the chamber?

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.

it is the most commonly accepted one

hey there!

mass = 6.75 g

volume =   9 cm³

therefore:

d = mass / volume

d   = 6.75 / 9

d = 0.7 g/cm³

answer b