28. An element “X” has five major isotopes, which are listed below along with their abundances. What is the element?
Isotope
Percent Natural Abundance
Atomic Mass
46X
47x
48x
49X
50%
8.00%
7.30%
73.80%
5.50%
5.40%
45.95269
46.951764
47.947947
48.947841
49.944792

the x is last of alll because they all whole

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.