1.25 g of copper carbonate was added to a beaker containing 20 g of HCl. After completion of chemical reaction, the mass of the beaker and its contents were less than 21.25 g. Why does this happen?
Chemical equation for the above reaction can be written as
Since, CO2 gas escapes in air and hence, its mass hoes unrecorded. This explains, why the recorded mass is less than 21.25 g.