Which of the following is the best example of law of conservation of mass?

12 g

of carbon combines with

32 g

of oxygen to form

44 g of C O_{2}

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When

12 g

of carbon is heated in a vacuum there is no change in mass.

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The weight of a piece of platinum is the same before and after heating in air.

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A sample of air increases in volume when heated at constant pressure but its mass remains unaltered

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Solution

The correct option is A $12 g$ of carbon combines with $32 g$ of oxygen to form $44 g of C O_{2}$
The law of conservation of mass states that : The mass in an isolated system can neither be created nor be destroyed but can be transformed from one form to another.
In option (a) the masses of the Reactants (mass of Carbon + mass of oxygen) is equal to the mass of the product formed $(m a s s of C O_{2}$ )

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