
Concept explainers
Interpretation: The mass in grams and volume inliters of water that would have to be evaporated through perspiration to rid the body of heat generated during two hours needs to be calculated.
Concept Introduction: The change in enthalpy of reaction is always calculated for the balanced chemical equation and can be used to calculate the energy change for the given moles or masses of reactant or product molecules. The enthalpy of vaporization can be defined as the enthalpy change during the conversion of liquid to the vapor state. The relation between the enthalpy of vaporization and heat can be written as:

Answer to Problem 63A
Mass of water = 4878 g
The volume of water = 4878 mL
Explanation of Solution
Given information:
The heat generated from body = 5500 kJ
Hours = 2
Heat of vaporization = 40.6 kJ/mol
Here,
q = 5500 kJ
and,
Calculate moles of water in 2 hours:
Calculate the mass and volume of water:
Molar mass of water = 18.0 g/mol
Density = 1 g/mL
Thus,
mass of water = 4878 g
Volume of water = 4878 mL
Chapter 10 Solutions
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