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2 January, 14:03

Cu + 2AgNO3 + Cu (NO3) 2 + 2Ag

How many grams of Cu react with 105.2 g of Ag?

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Answers (1)
  1. 2 January, 14:21
    0
    Mass of Cu react = 31.14 g

    Explanation:

    Given dа ta:

    Mass of Cu react = ?

    Mass of silver produced = 105.2 g

    Solution:

    Chemical equation:

    Cu + 2AgNO₃ → 2Ag + Cu (NO₃) ₂

    Number of moles of Ag:

    Number of moles = mass / molar mass

    Number of moles = 105.2 g/107.87 g/mol

    Number of moles = 0.98 mol

    Now we will compare the moles of Cu and silver from balance chemical equation:

    Ag : Cu

    2 : 1

    0.98 : 1/2*0.98 = 0.49 mol

    Mass of Cu:

    Mass = number of moles * molar mass

    Mass = 0.49 mol * 63.546 g/mol

    Mass = 31.14 g
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