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Anonymous
Anonymous asked in Science & MathematicsChemistry · 2 months ago

A current of 10.0 A is used to plate aluminum for a total time of 2.5 hours. How many grams of aluminum were plated during that time? ?

Al^+3+3e- -> Al

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  • 2 months ago

    2.5 hr = 9000 s

    10 A = 10 C/s

    10 C/s x 9000 s = 90000 C

    1 C = 6.242e18 electrons

    90000 C x  6.242e18 electrons/C = 5.62e23 electrons

    each Al atom takes 3 electrons

    5.62e23 electrons / 3 electrons/atom = 1.873e23 atoms

    6.022e23 atoms/mole Avogadro constant

    1.873e23 atoms / 6.022e23 atoms/mole = 0.311 mol

    Al is 27 g/mol

    27 g/mol x 0.311 mol = 8.40 g

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