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Chemistry Questions? (Cations, Anions, and Empirical Formula)?

The following equation represents the formation of a/an:

Li -----> 1e- + Li+

a. cation

b. anion

c. polyatomic ion

d. chemical reaction

Please help! I originally chose A but now I am second guessing myself.

Also, there's this problem that I've been trying to solve but I just can't seem to do it. If anyone could explain to me how to do it that would be great. Thanks!

A 136.0584g sample of a compound is analyzed and found to contain just hydrogen and oxygen. It was determined that the sample contained 4.031% hydrogen by mass. What is the empirical formula?

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