Question

percent composition and molecular formula
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webb has calculated the percent composition of a compound. how can he check his result?
○ by making sure they are in the lowest ratio
○ by adding them to see if they total 100
○ by checking that they are whole-number multiples
○ by dividing them by the molar mass

Explanation:

Percent composition represents the relative mass of each element in a compound as a percentage of the total mass of the compound. The sum of all these percentage values must equal 100% (accounting for minor rounding errors), so adding them to check for a total of 100 is the correct way to verify the result. The other options describe steps for finding empirical/molecular formulas, not verifying percent composition.

Answer:

by adding them to see if they total 100