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In an experiment, 2.4 g of iron oxide on...

In an experiment, 2.4 g of iron oxide on iron. In another experiment, 2.9 g of iron oxide gave 2.09 g of iron on reduction. Which law is ilustrated from the above data?

A

Law of constant proportions

B

Law of multiple proportions

C

Law of conservation of mass

D

Law of reciprocal proportions

Text Solution

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The correct Answer is:
To determine which law of chemistry is illustrated by the given data, we will analyze the mass of iron oxide and the mass of iron produced in two separate experiments. ### Step-by-Step Solution: 1. **Identify the Data from the Experiments**: - In the first experiment: - Mass of iron oxide = 2.4 g - Mass of iron produced = 1.68 g - In the second experiment: - Mass of iron oxide = 2.9 g - Mass of iron produced = 2.09 g 2. **Calculate the Mass of Oxygen in Each Experiment**: - For the first experiment: - Mass of oxygen = Mass of iron oxide - Mass of iron - Mass of oxygen = 2.4 g - 1.68 g = 0.72 g - For the second experiment: - Mass of oxygen = Mass of iron oxide - Mass of iron - Mass of oxygen = 2.9 g - 2.09 g = 0.81 g 3. **Calculate the Ratio of Masses of Iron to Oxygen**: - For the first experiment: - Ratio of iron to oxygen = Mass of iron / Mass of oxygen - Ratio = 1.68 g / 0.72 g = 2.33 (or simplified to 7:3) - For the second experiment: - Ratio of iron to oxygen = Mass of iron / Mass of oxygen - Ratio = 2.09 g / 0.81 g = 2.58 (or simplified to 7:3) 4. **Compare the Ratios**: - Both experiments yield the same ratio of iron to oxygen (7:3), indicating that the elements combine in a fixed proportion by mass. 5. **Conclusion**: - The law illustrated by the data is the **Law of Constant Proportions** (or Law of Definite Proportions), which states that a chemical compound always contains its component elements in fixed ratio by mass, regardless of the source or method of preparation.
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Knowledge Check

  • On reduction 1.644 g of hot iron oxide give 1.15g of iron. Evaluate the equivalent weight of iron.

    A
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    B
    19.13
    C
    18.95
    D
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