Question

Which of the following is the best example of law of conservation of mass?
(A) 12 g of carbon combines with 32 g of oxygen to form 44 g of CO₂.
(B) When 12 g of carbon is heated in a vacuum there is no change in mass.
(C) A sample of air increases in volume when heated at constant pressure but its mass remains unaltered.
(D) The weight of a piece of platinum is the same before and after heating in air.

Answer 1

Answer:

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Answer 2

Dear Student,

◆ Answer -

(A) 12 g of carbon combines with 32 g of oxygen to form 44 g of CO₂

● Explanation -

• Law of conservation of mass states that the total amount of mass remains constant in an isolated system in spite of any physical or chemical changes that may take place.
• In option (A), reactants mass = 12 + 32 = 44 g and product mass = 44 g.
• Therefore, it is best example of law of conservation of mass.

Hope that helps you...