
Concept explainers
How much
(a)
91.51 g
(b)
274.5 g
(c)
513.8 g
(d)
85.63 g
(e)
257.0 g

Interpretation:
The amount of
Concept introduction:
The concept of determining the amount of product formed at the end of a chemical reaction is based on identifying the limiting reactant in that reaction. This is done as follows:
1. Balancing the given chemical equation.
2. Determining the molar mass of each compound.
3. Converting the mass into moles and vice versa by using stoichiometric factors.
Moles can be calculated as
The mass of a compound can be calculated as
The molar mass can be calculated by:
Example:
Answer to Problem 3KSP
Solution: Option (e).
Explanation of Solution
Reason for the correct option:
Mass of calcium phosphide,
The balanced equation is as follows:
Then, from the above equation, the molar mass of the reactants
According to the above equation:
With the help of the above equations, the moles of
The moles of
Now, by comparing the valuesfrom both the reactants, the moles of
Therefore, the total amount of
Hence, option (e) is correct.
Reasons for the incorrect options:
Option (a) is incorrect because the conversion of Fahrenheit into degree Celsius is correct, but the conversion of Celsius into Kelvin is wrong.
Option (b) is incorrect because, on solving with the help of theabove equations, the answer does not match option (b).
Option (c) is incorrect because, on solving with the help of the above equations, the answer does not match option (d).
Option (d) is incorrect because, on solving with the help of the above equations, the answer does not match option (e).
Hence, options(a), (b), (c), and (d) are incorrect.
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Chapter 3 Solutions
Chemistry
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