Manipal Entrance Test 2019 Chemistry Paper

If p, T, ρ and R represents pressure, temperature, density and universal gas constant then ideal gas equation
pV = nRT for n mole of gas
pV = RT for 1 mole of gas
We know that
M = V × ρ ⇒V=

M

ρ

Put the value of V in gas equation
p×

M

ρ

=RT
then molar mass of gas
M=

ρ‌RT

p