The word family implies that the elements in a family have like properties. what property do the elements of the noble gas family all share? a) they are not reactive. b) they are very reactive. c) they are found in the earth's atmosphere. d) they react readily with oxygen in the air.

The answer is A. because it is pretty obvious.

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.