Conversions between grams, moles and atoms
Lecture 4-Chemical Substances and Mole concept
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Determining the Formula of an Unknown compound
, moles and atoms
moles and number of particles
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).
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
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
- simplest whole-number ratio of atoms (
of each element
) in a formula (in
- the “true”
ratio of atoms in a formula
; often a whole-number multiple of the empirical formula
We can determine empirical formulas from %
; a good analysis tool.
Convert given amounts to moles
Mole ratio (divide all moles by the smallest number of moles)
The numbers represent subscripts.
numbers are not whole numbers
, multiply by some factor to make them whole.
on multiplying by an integer
number of moles will not change because we multiply all the subscripts by same integer.
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