# Reading Log Chapter11 - Section 11.4 Mass of Element Mass...

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Jacob Zipperstein Reading Log Chapter: 11 The Mole Section 11.1 Mole – The Mole, (mol) is the SI base unit used to measure the amount of a substance. Avogadro’s number : 6.02 X 10^23 – Enormous number. Counts very small particles. Moles to Particles – Particles to Moles Conversion Factor: 6.02 X 10^23 Particles 1 Mole 6.02 X 10 ^23 particles Number of Moles X 1 Mole = Number of Representative Particles 1 Mole Number of representative particles X 6.02 X 10^23 = Number of Moles Section 11.2 Molar Mass : The mass in grams of one mole of any pure substance. The MM of an element is = atomic mass and has the units g/mol Number of Grams Number of Moles X 1 Mole = Mass Section 11.3 You must calculate the number of grams that corresponds to the necessary number of moles – in order to measure a certain amount of moles. Molecules or Formula Units – Representative Particles Molar Mass – Numbers of Grams / 1 Mole Inverse of Molar mass – 1 Mole / Number of Grams

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Unformatted text preview: Section 11.4 Mass of Element. Mass of Compound X 100 = Percent by mass Percent Composition : The percent by mass of any element in a compound can be found by dividing the mass of the element by the mass of the compound and then you multiply by 100. Jacob Zipperstein Empirical Formula : (compound) the formula with the smallest whole number mole ratio of the elements If they do not come out to be whole numbers, you must make them whole. Simply multiply the fraction to make it a whole number. Molecular Formula : specifies the actual number of atoms of each element in one molecule or formula unit of the substance Must find Empirical Formula to find Molecular Formula Molecular Formula = (Empirical Formula) n Section 11.5 Anhydrous – means with out any water remaining Hydrate – a compound that has a specific number of water molecules bound to its atoms...
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## This note was uploaded on 02/23/2010 for the course ENGLISH 1011 taught by Professor Thompson during the Spring '07 term at Berkeley.

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Reading Log Chapter11 - Section 11.4 Mass of Element Mass...

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