Which one of the following statements about the law of conservation of mass is correct ........

General Science (NDA) Physics

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Which one of the following statements about the law of conservation of mass is correct?

A given compound always contains exactly same proportion of elements.

When gases combine in a reaction, they do so in a simple ratio by volume, provided all gases are at room temperature

Matter can neither be created nor destroyed.

Equal volumes of all gases at same temperature and pressure contain equal number of molecules

Explanation:

The law of conservation of mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants. The law of conservation of mass is useful for a number of calculations and can be used to solve for unknown masses, such the amount of gas consumed or produced during a reaction.