
Concept explainers
Interpretation: The number of moles of
Concept introduction: The ratio of mass of substance to its molar mass is said to be number of moles of that substance.
The ratio of amount of any two compounds involved in a

Answer to Problem 57A
Explanation of Solution
Given:
The given reaction is unbalanced as the number of atom of Na and F on the reactant side is 3 and 6, whereas on the product side is 1 so, in order to balance the reaction the coefficient 4 is written before Na on the reactant side and coefficient 6 is written before NaF on the product side. So, the balanced reaction is:
From the balanced chemical reaction, the mole ratio of
Interpretation: The mass of
Concept introduction: The ratio of mass of substance to its molar mass is said to be number of moles of that substance.
The ratio of amount of any two compounds involved in a chemical reaction in terms of mole is said to be mole ratio, and used as a conversion factor between reactants and products.

Answer to Problem 57A
The mass of
Explanation of Solution
The balanced reaction is:
From the balanced chemical reaction, the mole ratio of
Now, the mass of
The molar mass of
Hence, the mass of
Chapter 9 Solutions
World of Chemistry, 3rd edition
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