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ChemistryGeneral Chemistry

Lewis Form from Mass Percent: NF₃ Formula, Structure, and Formal Charges

Use nitrogen and fluorine mass percentages and an approximate molar mass to find NF₃, draw every electron pair, and check all formal charges.

Question

A compound has an approximate molar mass of 70 g/mol. Its composition by mass is 19.7% nitrogen and 80.3% fluorine. Determine its chemical formula, draw a complete Lewis structure, and assign a formal charge to every atom.

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Evidence boundary

This answer addresses Chemistry 2e Chapter 7 exercise 61, including its mass composition, approximate molar mass, chemical formula, complete Lewis drawing, and all formal charges. The 100 g basis is a calculation convenience, not an experimental sample. The diagram represents electron pairs and connectivity, not measured bond angles or partial atomic charges.