Suppose that you want to make 12 g of lithium oxide. What are the minimum masses of lithium and oxygen you will need?

Question

Suppose that you want to make 12 g of lithium oxide.

What are the minimum masses of lithium and oxygen you will need?

A. Li= 5.6 g O2= 6.4 g
B. Li 6.5 g O2= 4.6 g
C. Li= 0.6 g O2 46.4 g
D. Li= 15.6 g O2 6.4 g

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Thu Thảo 2 months 2021-07-25T06:07:00+00:00 1 Answers 2 views 0

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    2021-07-25T06:08:34+00:00

    Answer:

    A. Li= 5.6 g O2= 6.4 g

    Explanation:

    Lithium oxide, Li2O, is an oxide that contains 2 moles of Li and 1 mole of O per mole of oxide. To solve this question we must find the mass of each atom in the molecule as follows:

    2Li = 2*6.941g/mol = 13.882g/mol

    O = 1*16g/mol = 16g/mol

    Molar mass Li2O:

    16+13.882 = 29.882g/mol

    The mass of lithium is:

    12g * (13.882g/mol / 29.882g/mol) = 5.6g Li

    And the mass of oxygen:

    12g * (16g/mol / 29.882g/mol) = 6.4g O

    Right answer is:

    A. Li= 5.6 g O2= 6.4 g

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