Which of the following quantities is the same for one mole of Br2(l) and one mole of He(g)?

Which of the following quantities is the same for one mole of Br_2(l) and one mole of He_(g)?

A Number of molecules
B Number of atoms
C Total mass of the particles
D Volume occupied at s.t.p

waec 2003 chemistry

The correct answer is A. Number of molecules

No explanation given

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