Calculate (to the nearest 0.1 u) the formula mass of these compounds.
- (a) carbon dioxide, CO2
- (b) methane, CH4
- (c) sodium phosphate, Na3PO4
(a)
Answer to Problem 3E
Explanation of Solution
Formula mass of any compound is given as the sum of the atomic masses of the constituent atoms given in the chemical formula of a substance. Formula mass and atomic mass are abbreviated as FM and AM respectively.
The formula mass of carbon dioxide
Atomic mass (AM) of carbon atom is
Atomic mass (AM) of oxygen atom is
Substitute
equation (1).
Conclusion:
Therefore, the formula mass of carbon dioxide
(b)
Answer to Problem 3E
Explanation of Solution
Formula mass of any compound is given as the sum of the atomic masses of the constituent atoms given in the chemical formula of a substance. Formula mass and atomic mass are abbreviated as FM and AM respectively.
The formula mass of methane
Atomic mass (AM) of carbon atom is
Atomic mass (AM) of hydrogen atom is
Substitute
equation (2).
Conclusion:
Therefore, the formula mass of methane
(c)
Answer to Problem 3E
Explanation of Solution
Formula mass of any compound is given as the sum of the atomic masses of the constituent atoms given in the chemical formula of a substance. Formula mass and atomic mass are abbreviated as FM and AM respectively.
The formula mass of sodium phosphate
Atomic mass (AM) of sodium atom is
Atomic mass (AM) of phosphorus atom is
Atomic mass (AM) of oxygen atom is
Substitute
Conclusion:
Therefore, the formula mass of sodium phosphate
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Chapter 12 Solutions
An Introduction to Physical Science
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- An Introduction to Physical SciencePhysicsISBN:9781305079137Author:James Shipman, Jerry D. Wilson, Charles A. Higgins, Omar TorresPublisher:Cengage Learning