(a) state the law of conservation of mass. (b) in a chemical reaction 4.2g of sodium hydrogen carbonate reacted with 3.0g of ethanoic acid, the products
obtained were 4.1g of sodium ethanoate, 0.9g of water and 2.2g of carbon dioxide. show that these observations are in agreement with the law of conservation of mass. (c) state the postulates of Dalton 's atomic theory which can explain the law of conservations of mass.