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11 July, 11:07

Calculate the number of moles of the indicated sub - stance in each of the following samples. a. 41.5 g of MgCl2 b. 135 mg of Li2O c. 1.21 kg of Cr d. 62.5 g of H2SO4 e. 42.7 g of C6H6 f. 135 g of H2O2

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  1. 11 July, 11:37
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    A: 0.436 moles MgCl2

    B: 0.00452 moles Li2O

    C: 23.3 moles Cr

    D: 0.637 moles H2SO4

    E: 0.547 moles C6H6

    F: 3.97 moles H2O2

    Explanation:

    A: Calculate the number of moles of 41.5 grams of MgCl2

    Molar mass of MgCl2 = 95.21 g/mol

    Moles MgCl2 = 41.5 grams / 95.21 g/mol = 0.436 moles

    B: Calculate the number of moles of 135 mg of Li2O

    Molar mass of Li2O = 29.88 g/mol

    Moles Li2O = 0.135 grams / 29.88 g/mol = 0.00452 moles

    C: Calculate the number of moles of 1.21 kg of Cr

    Molar mass of Cr = 52.0 g/mol

    Moles Cr = 1210 grams / 52.0 g/mol = 23.3 moles

    D: Calculate the number of moles of 62.5 grams of H2SO4

    Molar mass of H2SO4 = 98.08 g/mol

    Moles H2SO4 = 62.5 grams / 98.08 g/mol = 0.637 moles

    E: Calculate the number of moles of 42.7 grams of C6H6

    Molar mass of C6H6 = 78.11 g/mol

    Moles C6H6 = 42.7 grams / 78.11 g/mol = 0.547 moles

    F: Calculate the number of moles of 135 grams of H2O2

    Molar mass of H2O2 = 34.01 g/mol

    Moles H2O2 = 135 grams / 34.01 g/mol = 3.97 moles
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