Question
If you heat 25 g of reactant ‘A’ with 50 g of reactant ‘B’. You obtain 50 g of product ‘C’ and recover 20 g of unreacted ‘B’. Which of the following law is true for the above condition?
- Law of conservation of mass
- Law of multiple proportion
- Law of constant proportion
- Both A and C
Hint:
The mass of both sides needs to be calculated in the form of ratios to check the law that explains the working of the equation.
The correct answer is: Both A and C
- The law that explains this is the law of conservation of mass and the law of constant proportion.
- The Law of conservation of mass states that in a chemical reaction, the mass of reactant and products is conserved. It explains that in an isolated system, mass can neither be created nor destroyed. As we can see here, 25 g of A and 50 g of B form 75 g of reactants and on the other side, 25g of unreacted D and 50 g of C again make 75 grams of the product. Since the amount is the same, it proves the law of conservation of mass.
- The law of constant proportion states that chemical compounds are composed of elements that are known to be present in a fixed ratio by mass. As given, 25g of A combines with 50 g of B to give 50 g of C. Thus, 25 g of B is consumed only by 25 g of A. The ratio still comes out to be 1:1. This proves the law of constant proportion.
Law of definite proportion and Proust's law are the other names of law of constant proportion.
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