[[Correct Answer---->10 points?]]?

a)
PV = nRT
or, n = PV/RT
The two flasks under similar conditions (P, V and T are similar, and R is a constant). Therefore, the two flask contains similar numbers of moles of molecules.


b)
Molar mass of NH₃ = 14 + 3 = 17 g/mol
Molar mass of SO₂ = 32 + 16×2 = 64 g/mol

Refer to (1) :
No. of moles of NH₃ = No. of moles of SO₂
(Mass of NH₃)/17 = (Mass of SO₂)/64
(Mass of NH₃) : (Mass of SO₂) = 17 : 64

The flask of SO₂ contains more mass of the gas.


(c)
Assume that :
No. of moles of NH₃ = No. of moles of SO₂ = n mol

Each mole of NH₃ contains 4 moles of atoms (1 mole of N atoms and 3 moles of H atoms).
Thus, no. of moles of atoms in NH₃ = 4n

Each mole of SO₂ contains 3 moles of atoms (1 mole of S atoms and 2 moles of S atoms).
Thus, no. of moles of atoms in SO₂ = 3n

As 4n > 3n
The flask of NH₃ contains more number of atoms.