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A sample (5.6 g) containing iron is completely dissolved in cold dilute HCl to prepare a 250 mL of solution. Titration of 25.0 mL of this solution requires 12.5 mL of 0.03 M KMnO4 solution to reach the end point. Number of moles of Fe2+ present in 250 mL solution is x × 10−2 (consider complete dissolution of FeCl2). The amount of iron present in the sample is y% by weight.
(Assume: KMnO4 reacts only with Fe2+ in the solution, Use: Molar mass of iron as 56 g mol−1)
Q. The value of y is _______.
    Correct answer is '18.75'. Can you explain this answer?
    Most Upvoted Answer
    A sample (5.6 g) containing iron is completely dissolved in cold dilut...
    Mass of sample = 5.6 g
    Number of moles of Fe = 1.88 x 10-2 mol
    Molar mass of Fe = 56 g/mol
    Mass of Fe = Moles of Fe x Molar mass 


    ⇒ y = 18.75%
    The value of y is 18.75
    Free Test
    Community Answer
    A sample (5.6 g) containing iron is completely dissolved in cold dilut...
    To find the number of moles of Fe2+ present in the 250 mL solution, we need to use the information given in the question.

    First, let's calculate the number of moles of KMnO4 used in the titration:

    Moles of KMnO4 = concentration of KMnO4 * volume of KMnO4 solution used
    = 0.03 M * 12.5 mL
    = 0.375 mmol

    Since the stoichiometry of the reaction between Fe2+ and KMnO4 is 5:1, the number of moles of Fe2+ present in the 25.0 mL of the solution is:

    Moles of Fe2+ = 0.375 mmol * (5/1)
    = 1.875 mmol

    Now, let's calculate the concentration of Fe2+ in the original solution:

    Moles of Fe2+ in 250 mL solution = Moles of Fe2+ in 25.0 mL solution * (250 mL/25.0 mL)
    = 1.875 mmol * 10
    = 18.75 mmol

    Finally, let's convert the moles of Fe2+ to grams:

    Mass of Fe2+ in 250 mL solution = Moles of Fe2+ in 250 mL solution * molar mass of Fe2+
    = 18.75 mmol * (55.845 g/mol)
    = 1046.84 mg
    = 1.0468 g

    Therefore, the number of moles of Fe2+ present in the 250 mL solution is approximately 1.0468 g.
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    A sample (5.6 g) containing iron is completely dissolved in cold dilute HCl to prepare a 250 mL of solution. Titration of 25.0 mL of this solution requires 12.5 mL of 0.03 M KMnO4 solution to reach the end point. Number of moles of Fe2+ present in 250 mL solution is x × 10−2 (consider complete dissolution of FeCl2). The amount of iron present in the sample is y% by weight.(Assume: KMnO4 reacts only with Fe2+ in the solution, Use: Molar mass of iron as 56 g mol−1)Q.The value of y is _______.Correct answer is '18.75'. Can you explain this answer?
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    A sample (5.6 g) containing iron is completely dissolved in cold dilute HCl to prepare a 250 mL of solution. Titration of 25.0 mL of this solution requires 12.5 mL of 0.03 M KMnO4 solution to reach the end point. Number of moles of Fe2+ present in 250 mL solution is x × 10−2 (consider complete dissolution of FeCl2). The amount of iron present in the sample is y% by weight.(Assume: KMnO4 reacts only with Fe2+ in the solution, Use: Molar mass of iron as 56 g mol−1)Q.The value of y is _______.Correct answer is '18.75'. Can you explain this answer? for JEE 2024 is part of JEE preparation. The Question and answers have been prepared according to the JEE exam syllabus. Information about A sample (5.6 g) containing iron is completely dissolved in cold dilute HCl to prepare a 250 mL of solution. Titration of 25.0 mL of this solution requires 12.5 mL of 0.03 M KMnO4 solution to reach the end point. Number of moles of Fe2+ present in 250 mL solution is x × 10−2 (consider complete dissolution of FeCl2). The amount of iron present in the sample is y% by weight.(Assume: KMnO4 reacts only with Fe2+ in the solution, Use: Molar mass of iron as 56 g mol−1)Q.The value of y is _______.Correct answer is '18.75'. Can you explain this answer? covers all topics & solutions for JEE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A sample (5.6 g) containing iron is completely dissolved in cold dilute HCl to prepare a 250 mL of solution. Titration of 25.0 mL of this solution requires 12.5 mL of 0.03 M KMnO4 solution to reach the end point. Number of moles of Fe2+ present in 250 mL solution is x × 10−2 (consider complete dissolution of FeCl2). The amount of iron present in the sample is y% by weight.(Assume: KMnO4 reacts only with Fe2+ in the solution, Use: Molar mass of iron as 56 g mol−1)Q.The value of y is _______.Correct answer is '18.75'. Can you explain this answer?.
    Solutions for A sample (5.6 g) containing iron is completely dissolved in cold dilute HCl to prepare a 250 mL of solution. Titration of 25.0 mL of this solution requires 12.5 mL of 0.03 M KMnO4 solution to reach the end point. Number of moles of Fe2+ present in 250 mL solution is x × 10−2 (consider complete dissolution of FeCl2). The amount of iron present in the sample is y% by weight.(Assume: KMnO4 reacts only with Fe2+ in the solution, Use: Molar mass of iron as 56 g mol−1)Q.The value of y is _______.Correct answer is '18.75'. Can you explain this answer? in English & in Hindi are available as part of our courses for JEE. Download more important topics, notes, lectures and mock test series for JEE Exam by signing up for free.
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