Ask Question
5 June, 20:16

Chromium metal is plated onto a car bumper at a current of 10.0 amperes for 100 seconds. The plating bath contains chromium in the form of CrO42 - ions. How many grams of Cr are deposited in this process? (The atomic weight of Cr is 51.996 amu.)

+3
Answers (1)
  1. 5 June, 20:26
    0
    0.54g of Cr

    Explanation:

    Current (I) = 10A

    Time (t) = 100s

    Molecular mass of Cr = 51.996 amu

    Faraday's first law of electrolysis states that

    The mass of the substance (m) of a given substance deposited at an electrode is directly proportional to the quantity of electricity or charge (Q) passed

    m = nQ

    M = mass of the substance

    n = electrochemical constant

    Q = charge passed through it

    Q = IT

    Q = (10 * 100) = 1000C

    1 moles = molarmass = Faraday's constant (96500C)

    Molar mass = Faraday's constant (96500C)

    51.996 g = 96500C

    How many grams will be liberated with 1000C

    51.996g = 96500C

    Xg = 1000C

    X = (1000 * 51.996) / 96500

    X = 51996 / 96500

    X = 0.5388g = 0.54 g of Cr will be deposited
Know the Answer?
Not Sure About the Answer?
Find an answer to your question 👍 “Chromium metal is plated onto a car bumper at a current of 10.0 amperes for 100 seconds. The plating bath contains chromium in the form of ...” in 📗 Chemistry if the answers seem to be not correct or there’s no answer. Try a smart search to find answers to similar questions.
Search for Other Answers