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)?

Answer Details

The quantity that is the same for one mole of Br_2(l) and one mole of He_(g) is the number of molecules. One mole of any substance contains the same number of particles, known as Avogadro's number (6.022 x 10²³ particles per mole). Therefore, one mole of Br_2(l) and one mole of He_(g) both contain the same number of molecules. The number of atoms and total mass of particles in one mole of Br_2(l) and one mole of He_(g) are different, as Br_2(l) is a molecular substance and contains two bromine atoms per molecule, while He_(g) is an element and contains only one helium atom per particle. The volume occupied at s.t.p. by one mole of Br_2(l) and one mole of He_(g) is also different, as the volume depends on the size and shape of the particles, and the conditions of temperature and pressure.