Which of the following statements best explains the law of conservation of mass?

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36 g of carbon combines with 32 g of oxygen to form 68 g of CO₂.

100 g of water is heated to give steam.

A sample of N₂ gas is heated at constant pressure without any change in mass.

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

answer is C.

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Detailed Solution

According to the law of conservation of mass, the mass of the products in a chemical reaction must be equal the mass of the reactants.

Among the given options, only third option involves a chemical change/reaction as:

C+O₂→CO₂

and $m_{reactants} = m_{products}$

36 + 32 = 68 g

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