Answers

2016-03-13T07:20:46+05:30
 Avogadro's Law states "Equal volumes of gases, at the same temperature and pressure, contain the same number of particles, or molecules." 

A mole is 6.022 * 10^23 particles (atoms or molecules, dependent upon the gas). 

Hydrogen gas is diatomic (H2). Helium gas is monatomic (He). Hydrogen will therefore have twice the number of atoms.
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