# CHE 131 Lecture Notes - Lecture 11: Molar Mass, Formula Composition, Chemical Formula

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###### CHE 131 Full Course Notes

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## Document Summary

Same molecular and empirical formula-relative ratio is the same. Many compounds have the same empirical formula but diff molecular formula. More hydrogen means more energy (better fuel) Reaction will produce water and carbon dioxide to measure mass and determine how much in the original compound. Need to convert grams to molar ratio. Then convert mole to integer (divide by smallest mole number) Mass % to empirical formula: convert mass% to moles, find smallest whole number ratio, ex, iron (iii) oxide is. 69. 94% fe, 30. 6: assume 100g of iron. Amount of bending depends on mass - heavier less bending lighter more. Spectrum allows you to determine the mass of molecules. Divide molar mass by empirical formulas to find molecular formula. Each molecule there are two formula units so you multiply everything by 2 9gives you. If you know mass % you know empirical, thus molecular molar mass in question > find the empricalformula)