What volume will 0.5 g of H2 occupy at s.t.p? [H = 1; 1 mole of a gas occupy 22.4 dm3 at s.t.p.]

Answer Details

To solve this problem, we need to use the formula: number of moles = mass / molar mass From the periodic table, the molar mass of hydrogen (H) is 1 g/mol. Therefore, the number of moles of H2 present in 0.5 g is: number of moles = 0.5 g / 2 g/mol = 0.25 mol At standard temperature and pressure (s.t.p), 1 mole of any gas occupies 22.4 dm^3. Therefore, 0.25 moles of H2 will occupy: volume = number of moles x 22.4 dm^3/mol = 0.25 x 22.4 dm^3 = 5.6 dm^3 Therefore, the correct answer is: 5.6 dm^3.