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    Identifying the correct metal

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    A sample of metallic element X, combines completely with oxygen gas (O2) forming a metal oxide of formula XO. If the amount of oxygen gas used is 32 grams, and the total amount of metallic oxide formed is 112 grams, Determine the identity of the metal.

    The choice is one of the following:

    1. sodium
    2. magnesium
    3. calcium
    4. radium
    5. potassium

    I did this to solve:

    (15.9994 amu O)(X/32 g)

    I substituted the atomic weights for the choices 1-5 and found that radium gave the answer. Is there a better way to solve this? Is this answer correct?

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    https://brainmass.com/chemistry/stoichiometry/identifying-correct-metal-272553

    Solution Summary

    Identification of metal from given %age data are examined.

    $2.19