What is the mass of 5 moles of sodium carbonate (Na2CO3)?
(Atomic masses: Na = 23 u; C = 12 u; O = 16 u)
Molar mass of sodium carbonate (Na2CO3) = 2×23+12+3×16 = 106 g
Mass of one mole of sodium carbonate (Na2CO3) = 106g
Mass of five moles of sodium carbonate (Na2CO3) = 5×106g = 530g.