Mole Concept And Molar Masses

By definition, one mole of any substance contains Avogadro's number of particles, which is 6.022 \times 10²³ particles (commonly approximated as 6.023 \times 10²³). This applies to atoms, molecules, or ions depending on the nature of the substance. So, 1 mole of H₂ gas contains exactly 6.023 \times 10²³ molecules of hydrogen gas. The correct answer is option (A):

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