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CHY 123 Lecture Notes - Lecture 7: Chemical Formula, Molar Mass, Empirical Formula

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School
Ryerson University
Department
Chemistry
Course
CHY 123
Professor
Derick Rousseau

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Document Summary

Chy chapter 3 mass relationships and chemical. Using the atomic mass of elements and the over all molar mass when in a compound, you can determine the mass percentage of each element in the compound. Do it everytime for each element in compound mass of a in whole x. The simplest whole number ratio b/w numbers of different elements in a compound. Glucose has a molecular formula of c6h12o6 so the empirical formula is. Example: vitamin c has 40. 92% carbon, 4. 58% hydrogen, and 54. 50% oxygen. Combustion analysis - a technique requiring you to burn a sample of the unknown substance in a large excess of oxygen gas. The combustion products will be trapped separately from each other and the weight of each combustion product will be determined. From this, you will be able to calculate the empirical formula of the substance. Example: we have a 0. 2000g sample made up of c, h, and o.

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Related Questions



Determine the empirical and molecular formulas of each of the following substances:
(a) Ibuprofen, a headache remedy, contains 75.69% C, 8.80% H, and 15.51% O by mass, and has a molar mass of 206 g/mol.
(b) Cadaverine, a foul-smelling substance produced by the action of bacteria on meat, contains 58.55% C, 13.81% H, and 27.40% N by mass; its molar mass is 102.2 g/mol.
(c) Epinephrine (adrenaline), a hormone secreted into the bloodstream in times of danger or stress, contains 59.0% C, 7.1% H, 26.2% O, and 7.7% N by mass; its MW is about 180 amu.

Empirial formula of ibuprofene is calculated by multiplying obtained ratio with 2, and the result is C13H18O2. The sum of atomic mass of C13H18O2 is 206 g/mol. Molecular formula is the same as empirical.

Empirical formula of cadaverine, C5H14N2 is obtained by multiplying the moles of each atom with 2 in order to obtain the whole numbers. The weight of empirical formula is 102 g/mol, so it is at the same time the molecular formula.

c) 59.0% C, 7.1% H, 26.2% O, and 7.7% N

Empirical formula of adrenaline is C9H13NO3, and its mass is 183 g/mol. Since MW of hormone is about 180, molecular formula is the same as empirical formula.