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The formula for percent error is |experimental value-accepted value|/accepted value.

The lines stand for absolute value. They are there to prevent a negative percent error, seeing as that is not possible, and they have the same effect on the order of operations as a pair of parenthesis.

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Q: What is the percent of error in evaluating the molecular mass of a compound if the experimental value was 105.2 amu and the known value was 107.5 amu?
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An unknown sample with a molecular mass of 180.0g is analyzed to yield 40 percent C 6.7 percent H and 53.3 percent O What is the empirical formula and the molecular formula of this compound?

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For a chemical compound, ex. ABC: Percent (%) of A is (atomic weight of A x 100)/molecular weight of ABC.


How is percent composition by mass determined?

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The molecular formula of the compound can be calculated from the composition of element in a compound. The next steps are involved in the calculation of percentage of every element in a compound.


What is the molecular formula of a compound containing 89 percent cesium Cs and 11 percent oxygen O with a molar mass equals 298 gmol?

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