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A student heats 25g of reactant ‘A’ with 50g of reactant ‘B’. He obtains 50g of product ‘C’ and recovers 25 g of unreacted ‘B’. Which of the following law is confirmed in the following reaction?
- a)Law of constant proportion
- b)Law of conservation of mass
- c)Law of conservation of mass and Law of constant proportion
- d)Law of multiple proportion
Correct answer is option 'C'. Can you explain this answer?
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A student heats 25g of reactant ‘A’ with 50g of reactant &...
Two laws are followed in this question.
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First law is Law of definite proportion as follows:
Here 25 g of reactant A reacts with 50 g of reactant B to produce 50 g of product C. That means 25 g of A consumes only 25 g of B. The ratio is 1:1. Even if there would have been say 75 g B is present, still only 25 g of B will react with 25 g of A. Or if 10 g of B is present then only 10 g of A will react and remaining 15 g of A will remain unreacted.
Second law is Law of conservation of mass as follows :
There is 25 g of A and 50 g of B. That means total 75 g of reactant is present. On product side 50 g of C and 25 g of unreacted B is present. That means total 75 g of product is present. Hence, the correct option will be " Law of conservation of mass and Law of constant proportion ".
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A student heats 25g of reactant ‘A’ with 50g of reactant &...
Law of Conservation of Mass:
The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction. This means that the total mass of the reactants must be equal to the total mass of the products. In other words, the mass before the reaction should be the same as the mass after the reaction.
Law of Constant Proportions:
The law of constant proportions states that a compound always contains the same elements in the same proportion by mass, regardless of the source or method of preparation. This means that the ratio of the masses of the elements in a compound is always constant.
Explanation:
In the given reaction, reactant A (unknown mass) is heated with 50g of reactant B. The reaction produces 50g of product C and recovers 25g of unreacted B.
To determine which law is confirmed in this reaction, we need to examine the mass of the reactants and products.
According to the law of conservation of mass, the total mass of the reactants should be equal to the total mass of the products. Let's calculate the total mass of the reactants and products:
Total mass of reactants = mass of A + mass of B
Total mass of reactants = mass of A + 50g (mass of B)
Total mass of products = mass of C + mass of unreacted B
Total mass of products = 50g (mass of C) + 25g (mass of unreacted B)
From the given information, we know that the total mass of the reactants (A + B) is equal to the total mass of the products (C + unreacted B):
mass of A + 50g = 50g + 25g
mass of A + 50g = 75g
By subtracting 50g from both sides of the equation, we get:
mass of A = 75g - 50g
mass of A = 25g
Since the mass of reactant A is 25g, and the mass of the unreacted B is also 25g, this confirms both the law of conservation of mass and the law of constant proportions.
Conclusion:
The correct answer is option C: Law of Conservation of Mass and Law of Constant Proportions. The observation that the total mass of the reactants is equal to the total mass of the products confirms the law of conservation of mass. Additionally, the constant ratio of the masses of A, B, and C (25g:50g:50g) confirms the law of constant proportions.
The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction. This means that the total mass of the reactants must be equal to the total mass of the products. In other words, the mass before the reaction should be the same as the mass after the reaction.
Law of Constant Proportions:
The law of constant proportions states that a compound always contains the same elements in the same proportion by mass, regardless of the source or method of preparation. This means that the ratio of the masses of the elements in a compound is always constant.
Explanation:
In the given reaction, reactant A (unknown mass) is heated with 50g of reactant B. The reaction produces 50g of product C and recovers 25g of unreacted B.
To determine which law is confirmed in this reaction, we need to examine the mass of the reactants and products.
According to the law of conservation of mass, the total mass of the reactants should be equal to the total mass of the products. Let's calculate the total mass of the reactants and products:
Total mass of reactants = mass of A + mass of B
Total mass of reactants = mass of A + 50g (mass of B)
Total mass of products = mass of C + mass of unreacted B
Total mass of products = 50g (mass of C) + 25g (mass of unreacted B)
From the given information, we know that the total mass of the reactants (A + B) is equal to the total mass of the products (C + unreacted B):
mass of A + 50g = 50g + 25g
mass of A + 50g = 75g
By subtracting 50g from both sides of the equation, we get:
mass of A = 75g - 50g
mass of A = 25g
Since the mass of reactant A is 25g, and the mass of the unreacted B is also 25g, this confirms both the law of conservation of mass and the law of constant proportions.
Conclusion:
The correct answer is option C: Law of Conservation of Mass and Law of Constant Proportions. The observation that the total mass of the reactants is equal to the total mass of the products confirms the law of conservation of mass. Additionally, the constant ratio of the masses of A, B, and C (25g:50g:50g) confirms the law of constant proportions.
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A student heats 25g of reactant ‘A’ with 50g of reactant &...
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A student heats 25g of reactant ‘A’ with 50g of reactant ‘B’. He obtains 50g of product ‘C’ and recovers 25 g of unreacted ‘B’. Which of the following law is confirmed in the following reaction?a)Law of constant proportionb)Law of conservation of massc)Law of conservation of mass and Law of constant proportiond)Law of multiple proportionCorrect answer is option 'C'. Can you explain this answer?
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A student heats 25g of reactant ‘A’ with 50g of reactant ‘B’. He obtains 50g of product ‘C’ and recovers 25 g of unreacted ‘B’. Which of the following law is confirmed in the following reaction?a)Law of constant proportionb)Law of conservation of massc)Law of conservation of mass and Law of constant proportiond)Law of multiple proportionCorrect answer is option 'C'. Can you explain this answer? for Class 9 2024 is part of Class 9 preparation. The Question and answers have been prepared according to the Class 9 exam syllabus. Information about A student heats 25g of reactant ‘A’ with 50g of reactant ‘B’. He obtains 50g of product ‘C’ and recovers 25 g of unreacted ‘B’. Which of the following law is confirmed in the following reaction?a)Law of constant proportionb)Law of conservation of massc)Law of conservation of mass and Law of constant proportiond)Law of multiple proportionCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 9 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A student heats 25g of reactant ‘A’ with 50g of reactant ‘B’. He obtains 50g of product ‘C’ and recovers 25 g of unreacted ‘B’. Which of the following law is confirmed in the following reaction?a)Law of constant proportionb)Law of conservation of massc)Law of conservation of mass and Law of constant proportiond)Law of multiple proportionCorrect answer is option 'C'. Can you explain this answer?.
A student heats 25g of reactant ‘A’ with 50g of reactant ‘B’. He obtains 50g of product ‘C’ and recovers 25 g of unreacted ‘B’. Which of the following law is confirmed in the following reaction?a)Law of constant proportionb)Law of conservation of massc)Law of conservation of mass and Law of constant proportiond)Law of multiple proportionCorrect answer is option 'C'. Can you explain this answer? for Class 9 2024 is part of Class 9 preparation. The Question and answers have been prepared according to the Class 9 exam syllabus. Information about A student heats 25g of reactant ‘A’ with 50g of reactant ‘B’. He obtains 50g of product ‘C’ and recovers 25 g of unreacted ‘B’. Which of the following law is confirmed in the following reaction?a)Law of constant proportionb)Law of conservation of massc)Law of conservation of mass and Law of constant proportiond)Law of multiple proportionCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 9 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A student heats 25g of reactant ‘A’ with 50g of reactant ‘B’. He obtains 50g of product ‘C’ and recovers 25 g of unreacted ‘B’. Which of the following law is confirmed in the following reaction?a)Law of constant proportionb)Law of conservation of massc)Law of conservation of mass and Law of constant proportiond)Law of multiple proportionCorrect answer is option 'C'. Can you explain this answer?.
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