10 g of `CaCO_3` on heating gave 4.4 g of `CO_2` and 5.6 g of CaO. Show that these observations are in agreement with law of conservation of mass.

2 g of CaCO_(3) on strong heating gave 1.12 g of CaO and 448 ml of CO_2 . Show that the results illustrate the law of conservation of mass.

10g of CaCO_(3) contains

When 4.2 g of NaHCO_3 is added to a solution of CH_3COOH weight 10g, it is observed that 2.2g of CO_2 is released into atmosphere. The residue is found to weight 12.0g. Show that these observations are in agreement with the law of conservation of mass.

On complete combustion, 0.246 g of an organic compound gave 0.198 g of CO_2 and 0.1014 g of H_2O . Determine the percentage composition of carbon and hydrogen in the compound.