Concept explainers
Interpretation:
The mass of nitrogen in grams should be determined when total mass of compound is 475 g.
- 33.93 g
- 52.78 g
- 67.86 g
- 109.0 g
- 110.5 g
Concept introduction:
Number of moles is equal to the ratio of given mass to the molar mass.
The mathematical expression is given by:
Number of moles =
Molar mass of the molecule is equal to the sum of the masses of atoms present in the molecule.
Answer to Problem 17STP
Mass of nitrogen in 475 g of compound is
Explanation of Solution
According to the given figure,
Percentage of carbon = 19.68 %
Percentage of oxygen = 52.42 %
Percentage of hydrogen = 4.96 %
Percentage of nitrogen = 22.95 %
Let, total mass of the compound = 100 grams.
Thus, mass of carbon (
Mass of oxygen (
Mass of hydrogen (
Mass of nitrogen (
Now,
Molar mass of carbon = 12.011 g/mole
Number of moles of carbon =
=
Molar mass of oxygen = 15.999 g/mole
Number of moles of oxygen =
=
Molar mass of hydrogen = 1.008 g/mole
Number of moles of hydrogen =
=
Molar mass of nitrogen = 14.007 g/mole
Number of moles of nitrogen =
=
Divide each number of moles by smallest number 1.64.
Number of moles of carbon =
= 1 mole
Number of moles of oxygen =
= 2 moles
Number of moles of hydrogen =
= 3 moles
Number of moles of nitrogen =
= 1 mole
Thus, the formula of compound is
Total mass of compound is 475 g.
Molar mass of
Number of moles of
In
Number of moles of nitrogen = 1 mole
Molar mass of nitrogen = 14.007 g/mole
Thus, mass of nitrogen in 475 g of compound =
=
Mass of nitrogen =
Hence, option (D) is correct.
Chapter 21 Solutions
Chemistry: Matter and Change
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