1.70g of silver nitrate dissolved in 100g of water. 0.585g of sodium chloride is dissolved in 100g of water, both solutions are mixed, 1.435g of silver chloride and 0.85g sodium nitrate are formed.

Which law of chemical combination is illustrated from above observation?

Reaction becomes:

${\mathrm{AgNO}}_3+\mathrm{NaCl}\to \mathrm{AgCl}+{\mathrm{NaNO}}_3$

Total mass of reactants                            Total mass of products

= 1.70 + 0.585 = 2.285g                             =1.435+0.85 = 2.285g

Total mass of reactant is equal to total mass of products, therefore observation explains that the reaction obeys the law of conservation of mass.