Statement-1: The number of atoms in 1.0 L of H 2 gas at STP is twice the number of atoms in 0.5 L of O 2 gas at STP. Statement-2: Equal volumes of all gases at the same temperature and pressure co

Question

Statement-1: The number of atoms in 1.0 L of H 2 ​ gas at STP is twice the number of atoms in 0.5 L of O 2 ​ gas at STP. Statement-2: Equal volumes of all gases at the same temperature and pressure contain an equal number of moles.

TestHub · Accepted Answer

Statement-2 is true since at constant pressure and temperature, moles are proportional to volume

For Statement-1, at STP, 1.0 L of H₂ contains $2 \times (1.0/22.4) \times N_{A}$ atoms. 0.5 L of O₂ contains $2 \times (0.5/22.4) \times N_{A} = (1.0/22.4) \times N_{A}$ atoms.

Thus, Statement-1 is true. Statement-2 correctly explains the volume-mole relationship, which is essential for comparing atom counts.

Chemistry - Mole Concept Question with Solution | TestHub

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