Question

During exercise a person may give off 140 kcal of heat in 33 minutes by evaporation of water from the skin. How much water (in kilograms) has been lost?

Answer 1

mass is 0.239 kg

Step-by-step explanation:

given data

energy Q = 140 kcal

time t = 33 min

to find out

water lost

solution

we consider here water evaporate at temperature 20 degree

so heat of vaporization will be 585 kcal/kg

we apply here now formula that is

Q = mass × heat of vaporization

put here value and find mass

140 = mass × 585

mass = 140 / 585

mass = 0.239 kg

so mass is 0.239 kg