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CHE 110 Chapter Notes - Chapter 3: Molar Mass, Chemical Formula, Formula Unit

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azuremammoth471
8 Jan 2019
School
Quinnipiac University
Department
Chemistry
Course
CHE 110
Professor
All

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Document Summary

Chemical formulas and chemical equations have quantitative signi cance. Formula weight: sum of atomic weights off all atoms in the formula unit of a compound. Molecular weight: sum of the atomic weights of all the atoms in a molecule. For both formula weight and molecular weight use atomic mass units (amu) Use atomic weights of each atom from the periodic table. Mole (mol): amount of a substance that contains the same number of chemical units (ions, molecules, electrons, atoms, particles, etc) as. There are atoms in exactly 12 g of carbon-12. 1 mole of a substance contains avogadro"s number of molecules (or formula units or atoms) of that substance. The mass in grams of one mole of the substance (g/mol) Molar mass is the conversion factor from mass to moles & vice versa. Avogadro"s number converts from moles to atoms & vice versa. How many molecules are there in a 9. 27g sample of hcl? motormass.

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Related Questions


The mole is defined as the number of atoms in exactly 12 g of carbon-12. The mole equals 6.022×1023 items of whatever you are counting. This number is also called Avogadro's number, after Amadeo Avogadro (1776–1856). Molar mass is the mass of 1 mol of atoms of an element; for compounds, molar mass is the mass of 1 mol of molecules or formula units. Molar mass can be used to convert mass to moles for any element or compound.

How many grams are in 4.60 mol of sodium chloride (NaCl)?

How many water molecules are in a block of ice containing 2.25 mol of water (H2O)?

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.