To find:
Which substance contains more moles of oxygen?
Answer to Problem 2.77QA
Solution:
a) Both contain same mol of O.
b) N2O4
c) CO2.
Explanation of Solution
Calculations:
A mole is the SI unit of amount chemical substance. When writing units, it is written as “mol”.
a)
In one molecule of Al2O3, there are three atoms of oxygen. So we can say, the mole ratio between Al2O3 and O is
In one molecule of Fe2O3, there are three atoms of oxygen. So we can say, the mole ratio between Fe2O3 and O is
So
b)
In one molecule of SiO2, there are two atoms of oxygen. So we can say, the mole ratio between SiO2 and O is
In one molecule of N2O4, there are four atoms of oxygen. So we can say, the mole ratio between N2O4 and O is
So
c)
In one molecule of CO, there is one atom of oxygen. So we can say, the mole ratio between CO and O is
In one molecule of CO2, there are two atoms of oxygen. So we can say, the mole ratio between CO2 and O is
So,
Conclusion:
The number of moles of the oxygen calculated from the number of moles of compounds and mole ratio between them.
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