At stp, 1.0 liter of helium contains the same total number of atoms as
(1) 1.0 l of ne (3) 0.5 l of rn
(2) 2.0 l of kr (4) 1.5 l of ar

(1) 1.0 L of Ne

Explanation: According to Avogadro's law, 1 mole of every gas occupy 22.4 Liters at STP and contains avogadro's number of particles.

Avogadro's Law: This law states that volume is directly proportional to the number of moles of the gas at constant pressure and temperature.

  (At constant temperature and pressure)

Thus equal volumes contain equal number of atoms.

Hence, 1.0 liter of helium contains the same total number of atoms as

1.0 L of Ne at STP.

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