What is the empirical formula of Triethylenemelamine, C9H12N6?

Explanation:

The empirical fomula is the chemical formula using the least whole numbers that represent the ratio between the atoms.

shows the ratio between the elements C, H, and N but not is the most simplified form.

The ratio 9 : 12 : 6 may be simplified by dividing the trhee numbers by the their greatest common factor.

The greatest common factor is the common factor raised to the lowes power. Hence it is 3.

Thus the simplified numbers are:

And the empirical formula of triethylenemelamine is:

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"record the time to complete a chemical reaction" would most likely be part of a lab procedure.