Final answer:
The question is asking how much heat is transferred during evaporation when a person inhales and exhales; this requires the mass of evaporated water and the enthalpy of vaporization of water at body temperature to calculate.
Step-by-step explanation:
The student's question involves calculating the heat transfer that occurs due to evaporation of water from the lungs and breathing passages when a person inhales and exhales. Since air in the lungs is at body temperature, which is 37.0ºC, and because evaporation is an endothermic process where liquid water becomes vapor, it absorbs heat energy from the surroundings (in this case, the body). To calculate the heat transfer, we need the mass of the water evaporated and the enthalpy of vaporization of water at body temperature.
Unfortunately, without the value for the enthalpy of vaporization at 37ºC, we cannot determine the exact amount of heat transferred. However, the general process would involve using the mass of water evaporated per breath (given as 4.00×10−2 g) and multiplying it by the enthalpy of vaporization to get the heat transferred per breath in joules.