Which of the following statements best explains the law of conservation of mass, concerning a chemical change?

100 g of water is heated to give steam.

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A sample of

N_{2}

gas is heated at constant pressure without any change in mass.

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36 g of carbon combines with 32 g of oxygen to form 68 g of

C O_{2}

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10 g of carbon is heated in vacuum without any change in mass.

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Solution

The correct option is B 36 g of carbon combines with 32 g of oxygen to form 68 g of $C O_{2}$ .
According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants.
Among the given option only option C involves a chemical change/reaction as:
$C + O_{2} \to C O_{2}$
$m_{r e a c t a n t s} = m_{p r o d u c t s}$
$36 + 32 = 68 g$
option C is the best demonstration of the law of conservation of mass.

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