Which of the following is a suitable example for illustrating the law of conservation of mass?
(Atomic mass of O = 16 g/mol, H = 1 g/mole)

18

g of water is formed by the combination of

16

g oxygen with

2

g of hydrogen.

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18

g of water in liquid state is obtained by heating

18

g of ice.

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18

g of water is completely converted into vapour state on heating.

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18

g of water freezes at

4^{o} C

to give same mass of ice.

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Solution

The correct option is A $18$ g of water is formed by the combination of $16$ g oxygen with $2$ g of hydrogen.
The option (A) is a suitable example for illustrating the law of conservation of mass.

18g of water is formed by the combination of 16g oxygen with 2g of hydrogen.

Total mass of reactants (O and H) = 16 + 2 = 18 g.
The mass of product (water) = 18 g.

Since, the mass of product is equal to the total mass of reactants, the mass is conserved during the reaction, thus illustrating the law of conservation of mass.

Note: The option (A) represents chemical change while all other options represent physical change. The law of conservation of mass corresponds to a chemical change.

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Which of the following is a suitable example for illustrating the law of conservation of mass? (Atomic mass of O = 16 g/mol, H = 1 g/mole)

Which of the following is a suitable example for illustrating the law of conservation of mass?
(Atomic mass of O = 16 g/mol, H = 1 g/mole)