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23 August, 11:01

A 0.600 g sample of a compound of arsenic and oxygen was found to

contain 0.454 g of arsenic. What is the empirical formula of the

compound? *

A. AsO2

B. As2O

C. As2O3

D. AsO

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Answers (1)
  1. 23 August, 12:17
    0
    The answer is C. As2O3

    Explanation:

    0.600 gr of Arsenic and Oxygen.

    0.454 gr of Arsenic

    So, 0.146 gr of Oxygen will be in the compound.

    - First: The grams of each element must be divided by its atomic weight:

    0.454 gr As / 74.92u As = 0.00606 0.146 gr O / 16u O = 0.009125

    - Both results must be divided by the lowest number found:

    0.00606 / 0.00606 = 1 As 0.009125 / 0.00606 = 1.5 O

    - As one of the values is not an integer then both results are multiplied until both give an integer:

    1 As * 2 = 2 As 1.5 O * 2 = 3 O

    - Then the answer is given:

    As2O3
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