Copper carbonate breaks down on heating, like this: CuCO 3 ( s ) → CuO ( s ) + CO 2 ( g ) When 31 g of copper (ll) carbonate is used, what mass of solid remains after heating? A r : Cu = 64 , C = 12 , O = 16

Mass of one mole of copper carbonate = 64 g + 12 g + 3 × 16 g = 124 g Number of moles of copper carbonate in its 31 g = 31 g 124 g = 0 . 25 mol CuCO 3 ( s ) → CuO ( s ) + CO 2 ( g ) From the reaction it is clear that 1 mol of copper carbonate produces 1 mol of carbon dioxide. Therefore, 0 . 25 mol of copper carbonate produces 0 . 25 mol of carbon dioxide and 0 . 25 mol of solid remains after heating. Mass of one mole of copper oxide = 64 g + 16 g = 80 g Mass of 0 . 25 mol of copper oxide 0 . 25 mol × 80 g = 20 g

Copper carbonate breaks down on heating, like this: CuCO 3 ( s ) → CuO ( s ) + CO 2 ( g ) When 31 g of copper (ll) carbonate is used, what mass of solid remains after heating? A r : Cu = 64 , C = 12 , O = 16

Mass of one mole of copper carbonate = 64 g + 12 g + 3 × 16 g = 124 g Number of moles of copper carbonate in its 31 g = 31 g 124 g = 0 . 25 mol CuCO 3 ( s ) → CuO ( s ) + CO 2 ( g ) From the reaction it is clear that 1 mol of copper carbonate produces 1 mol of carbon dioxide. Therefore, 0 . 25 mol of copper carbonate produces 0 . 25 mol of carbon dioxide and 0 . 25 mol of solid remains after heating. Mass of one mole of copper oxide = 64 g + 16 g = 80 g Mass of 0 . 25 mol of copper oxide 0 . 25 mol × 80 g = 20 g