- the mass of 1.0505 x 1023 molecules of carbon dioxide (CO2).
[Molar mass of CO2 = 44 g]
- the number of molecules in 0.25 mole of ammonia (NH3).
- the formula unit mass of Na2SO3.
[Atomic mass of Na = 23 u, S = 32 u, O = 16 u, H = lu, NA = 6.022 x 1023 mol –1]