Question

5.2g of substance A reacts with 2.7g of substance B produces 7.9 gram of substance AB. How would you justify that the result is in agreement with the law of conservation of mass?

Answer 1

Mass of reactants = 5.2g + 2.7g = 7.9g

Mass of product = 7.9g

From 1 and 2 equation:

Mass of reactants = mass of product

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

Hope you find it helpful.

Answer 2

mass of reactant = 5.2g+2.7g =7.9g

mass of product = 7.9g

by the equation 1and2

mass of reactant =mass of product

hence by the law of conservation these observation are in agreement