Atiny sample of an aqueous solution of two substances r and p is sketched below as if it was under an imaginary microscope so powerful that molecules could be seen. (the water molecules are not shown.) r and p can interconvert. that is, r can turn into p, and p can turn back into r 2 the equilibrium constant k for this equilibrium is. predict the number of r and p molecules in this sample when the interconversion reaches equilibrium. a number of r molecules: d number of p molecules:

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.