Chemistry by OpenStax (2015-05-04)
1st Edition
ISBN: 9781938168390
Author: Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser
Publisher: OpenStax
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Textbook Question
Chapter 3, Problem 32E
What information do we need to determine the molecular formula of a compound from the empirical formula?
Expert Solution & Answer
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you are to determine the molecular formula for a molecular compound consisting of only carbon & hydrogen. The molar mass of this compound is 42.08 g/mol.
Part D:
The empirical formula has a molar mass of 14.026 g/mol (this is called the empirical molar mass). Divide the molar mass for the total compound given above by the empirical formula molar mass.
This will give you a number for multiplying the carbon atoms and hydrogen atoms in the empirical formula.
What is the multiplication value?
An unknown compound comprised of osmium and chlorine is 40.11%
osmium by mass.
a) If you assume 100.0 g of the compound, what is the mass in grams of
osmium that are present in the compound?
b) How many moles of osmium are present in 100.0 g of the compound?
c) If you assume 100.0 g of the compound, what is the mass in grams of
chlorine that are present in the compound?
!!!
d) How many moles of chlorine are present in 100.0 g of the compound?
e) Determine the empirical formula of the unknown compound.
f) What is the IUPAC name of the compound?
Chapter 3 Solutions
Chemistry by OpenStax (2015-05-04)
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