The fuel value of hamburger is approximately 3.3 kcal/g. If a man eats 0.75 pounds of hamburger for lunch and none of the energy is stored in his body, estimate the amount of water that would have to be lost in perspiration to keep his body temperature constant. The heat of vaporization of water may be taken as 2.41 kJ/g.

The mass of water lost to perspiration to maintain the temperature is 1.76 kg.

The given parameters;

The energy stored in the hamburger is calculated as follows;

454 g = 1 lb

4.186 kJ = 1 kcal

The mass of water lost to perspiration to maintain the temperature is calculated as follows;

where;

c is the specific heat capacity of water = 4.186 J/g⁰C

t₂ is the boiling point of water = 100⁰C

t₁ is normal body temperature = 37⁰C

Thus, the mass of water lost to perspiration to maintain the temperature is 1.76 kg.

Learn more about heat capacity here: link

Explanation:

The energy stored in the hamburger is:

The amount of water perspired is derived from the following formula:

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."

your answer would be “dry”