when 4.2gram of sodium hydrogen carbonate is added to a solution of hydrocloric acid weighing 10g . it is observed that 2.2gram of carbon dioxide is released into the atmosphere .The residue left behind is found to weigh 12gram . show that these observation are in agreement with a law of conservation of mass.

According to the law of conservation of mass " Mass can neither be created nor be destroyed "

which means that mass in a chemical reaction should remain conserved i.e. Total mass of reactant should be equal to the total mass of product.

The balanced equation for the reaction between sodium hydrogen carbonate and hydrochloric acid is as follows :-

NaHCO3  +  HCl  →  CO2  +  NaCl + H2O

Mass of  NaHCO3 = 4.2 g

Mass of HCl = 10g

Hence the total mass of reactant is (4.2+ 10)g = 14.2 g

Mass of  CO2  = 2.2g

Mass of residue = 12g

Hence the total mass of product is (2.2 + 12)g = 14.2g

since total mass of reactant = total mass of product therefore no mass is loss or no mass is created during the reaction which means the reaction is in agreement with law of conservation of mass.

Hence the observations are in agreement with law of conservation of mass. 

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