First step is to get the mass of the mercury: Pressure = mass/volume mass = pressure x volume = 13.5 x 1.85 = 24.975 gm
Second step is to calculate the number of moles in 24.975 gm: From the periodic table, the molar mass of mercury is 200.59 mass = number of moles x molar mass number of moles = 24.975 / 200.59 = 0.1245 mole
Last step is to get the number of atoms: Each mole contains 6.02 x 10^23 atoms number of atoms = 0.1245 x 6.02 x 10^23 = 7.4949 x 10^22 atoms
