A2.98 gram rectangular object has measurements of 21.1 mm, 14.2 mm, and 12.1 mm. what is the object’s density in units of g/ml? use significant figures. do not enter “g/ml” as part of your answer. do not use scientific notation.

density = 0.822  g/mL

Explanation:

We calculate the density knowing the flowing formula:

density = mass / volume

mass = 2.98 grams

volume = 21.1 × 14.2 × 12.1 = 3625 mm³ = 3.625 cm³ = 3.625 mL

density = 2.98 / 3.625 = 0.822  g/mL

the ideal gas law equation is as follows

pv = nrt

where p - pressure

v - volume

n - number of moles

r - universal gas constant

t - temperature

so if the pressure, volume and temperature are already known

we are left with n and r

since r is the universal gas constant that has a known fixed value then r too is known

so we are left with 'n'

once we know temperature volume and pressure

we can find the number of moles of gas present using the ideal gas law equation

this is not my own answer, this is an answer for the same question by the user blahblahmali. i do not claim ownership of this account.