
Conversions between grams, moles and atoms

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 Lecture 4Chemical Substances and Mole conceptConversions between grams, moles and atoms  Determine the number of moles in 85.00 grams of sodium chlorate, NaClO3
 Determine the number of molecules in 4.6 moles of ethanol, C2H5OH. (1 mole = 6.022 x 1023).
Exercises  Determine how many H atoms are in 4.6 moles of ethanol.
 solve the following questions.
 Q1: How many atoms of silver are in 3.50 moles of silver?
 Q2: Determine the number of moles of carbon disulfide in 34.75 grams of CS2.
 Q3: Determine the number of sulfur atoms in 34.75 grams of CS2.
 Q4: How many grams of oxygen are present in 5.75 moles of aluminum oxide, Al2O3?
 Q5: Determine the number of fluorine atoms in 24.24 grams of sulfur hexafluoride SF6.
Determining the Formula of an Unknown compound Empirical and Molecular Formulas  Empirical simplest wholenumber ratio of atoms (moles of each element) in a formula (in a compound).
 Molecular  the “true” ratio of atoms in a formula; often a wholenumber multiple of the empirical formula
 We can determine empirical formulas from % composition data; a good analysis tool.
Empirical Formulas  Steps for success
 Convert given amounts to moles
 Mole ratio (divide all moles by the smallest number of moles)
 The numbers represent subscripts.
 If the numbers are not whole numbers, multiply by some factor to make them whole.
 Note: on multiplying by an integer the relative number of moles will not change because we multiply all the subscripts by same integer.
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