
Concept explainers
(a)
Interpretation:
When 275 g of sulfur is burned in excess of oxygen, the heat evolved for the given reaction needs to be calculated.
Concept Introduction:
Mole is the amount of the substance that contains the same number of particles or atoms or molecules. Molar mass is defined as an average
(a)

Answer to Problem 30A
Heat evolved = 2536.72 kJ
Explanation of Solution
The given reaction is shown below:
The calculation of moles is shown below:
The calculation of heat evolved is shown below:
(b)
Interpretation:
When 25 mol of sulfur is burned in excess oxygen, the heat evolved for the given reaction needs to be determined.
Concept Introduction:
Heat is evolved in the exothermic reaction whereas heat is absorbed in the endothermic reaction.
(b)

Answer to Problem 30A
Heat evolved = 7400 kJ
Explanation of Solution
The given reaction is shown below:
The calculation of heat evolved is shown below:
(c)
Interpretation:
When 150 g of sulfur dioxide is produces, the heat evolved for the given reaction needs to be determined.
Concept Introduction:
Mole is the amount of the substance that contains the same number of particles or atoms or molecules. Molar mass is defined as an average mass of atoms present in the chemical formula. It is the sum of the atomic masses of all the atoms present in the chemical formula of any compound.
(c)

Answer to Problem 30A
Heat evolved = 692.64 kJ
Explanation of Solution
The given reaction is shown below:
The calculation of moles is shown below:
The calculation of heat evolved is shown below:
Chapter 10 Solutions
World of Chemistry
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