Question

state the law of conservation of mass and give one example​

Answer 1

Answer:

The law of conservation of mass states that mass can neither be created nor be destroyed, e.g. during a chemical reaction.

The masses and the number of reactants used during a chemical reactions remains constant and doesn't get destroyed or a new one's created

Answer 2

Answer:

The law of conservation of mass states that mass can neither be created nor be destroyed in a chemical reaction.

In short, the mass of the substances at left hand side (reactants) is equal to the mass of substances at right hand side (products) of the equation.

E.g. Zn +       2HCl              ⇒     ZnCl2         +   H2

      65g     +2(1+35.5)g        (65+2(35.5))         1(2)

Total mass on left hand side: 65+2(36.5) = 138g

Total mass on right hand side: 65 + 71 + 2 = 138g

Hence the mass is conserved.

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