
(a)
Interpretation: The substance with higher specific heat capacity from Al and Pb needs to be determined.
Concept Introduction: The specific heat capacity of substance can be defined as the heat required raising the temperature of 1 g of substance by 1 °C.
It is measure in J/ g.K or J/g °C. The specific heat capacity depends on the intermolecular forces. For example, water has high specific heat capacity due to presence of hydrogen bonds between molecules.
(a)

Answer to Problem 3E
Al has more specific heat capacity than Pb.
Explanation of Solution
Aluminum has more specific heat capacity than lead. This is because Al forms Al3+ whereas lead forms Pb2+ ions.
Due to more charge and attraction force, more energy is required to raise the temperature of 1 g of Aluminum that makes higher value of specific heat capacity of aluminum compare to lead.
(b)
Interpretation: The substance with higher specific heat capacity from H2 and Ar needs to be determined.
Concept Introduction: The specific heat capacity of substance can be defined as the heat required raising the temperature of 1 g of substance by 1 °C.
It is measure in J/ g.K or J/g °C. The specific heat capacity depends on the intermolecular forces. For example, water has high specific heat capacity due to presence of hydrogen bonds between molecules.
(b)

Answer to Problem 3E
H2 has more specific heat capacity than Ar.
Explanation of Solution
Hydrogen gas has more specific heat capacity than Argon. This is because argon is a noble gas and exist as monoatomic gas. The weak dispersion forces exist between argon atoms therefore it has lesser value of specific heat capacity compare to hydrogen gas.
(c)
Interpretation: The substance with higher specific heat capacity from F2 and Cl2 needs to be determined.
Concept Introduction: The specific heat capacity of substance can be defined as the heat required raising the temperature of 1 g of substance by 1 °C.
It is measure in J/ g.K or J/g °C. The specific heat capacity depends on the intermolecular forces. For example, water has high specific heat capacity due to presence of hydrogen bonds between molecules.
(c)

Answer to Problem 3E
Chlorine has more specific heat capacity than fluorine.
Explanation of Solution
Fluorine exists in gaseous state as due to small size and compact structure, only weak dispersion forces exist between molecules. As the molecular mass increases, the strength of dispersion forces increases therefore chlorine molecules have stronger dispersion forces. Thus the specific heat capacity of chlorine is more than fluorine.
Chapter U5 Solutions
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