Zinc carbonate has the chemical formula : ZnCO3 and the equation for thermal decomposition is: ZnCO3 .................> ZnO + CO2 1 mole of ZnCO3 produces one mole of ZnO
From the periodic table: molar mass of zinc = 65.38 gm molar mass of carbon = 12 gm molar mass of oxygen = 16 gm
molar mass of ZnCO3 = 65.38 + 12 + 3(16) = 125.38 gm molar mass of ZnO = 65.38 + 16 = 81.38 gm
125.38 gm of ZnCO3 produces 81.38 gm of ZnO, therefore: mass of ZnO in 375 gm = (375 x 81.38) / 125.38 = 243.4 gm
Based on the above calculations, the correct answer is 243 grams
