Mass Percentages of Elements in a Compound
There are two ways to describe molecular
structures for compounds, first; knowing how many atoms of each element
involved in the composition of the compound and second; know percentages in
terms of mass of elements in this structure, i.e., element in g 100 grams of
the compound, the percentage can be found for each element in the composition
of compound as follows:
1. Find the molar mass of a compound of molecular form.
2. Set and find the mass of each element in a molecule, i.e.,
product of atomic mass for each element x number of its atoms
3. Find percentage for the item in the compound by the following
relationship:
Example 1
Calculate the percentage for each
carbon, hydrogen and oxygen in the compound of isopentyl acetate (C7H14O2)
(substance released by the bee insect).
Solution:
Example 2
a) Find out mass percentages of
elements in C2H2O4 acid.
b) What is the mass percentage of
crystal water in C H O .2H O compound?
Solution:
Example 3
Find out the mass of Ca in 20 g of
Ca3(PO4)2.
Solution:
Example 4
In 10 g of CuSO4.5H2O,
a) Find out mass of Cu.
b) Find out mass percentage of
crystal water.
Solution:
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