Chemistry - College

The fuel value of hamburger is approx. 3.7 kcal/g. If a man eats 0.45 lbs 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. (1 lb = 453.6g)

1. 👍 0
2. 👎 0
3. 👁 645
1. Convert 0.45 # hamburger to grams
0.45 lb x (453.6 g/lb)= ?? grams hamburger.
?? g hamburger x 3.71 kcal/g = xx kcal.
I would convert that to kJoules.
xx kcal x (4.184 kJ/kcal) = yy kJ.
Then mass water x delta Hvap = yy kJ
Solve for mass water. I get something a little over 1 kg.

1. 👍 0
2. 👎 0

Similar Questions

1. Physics

The Speed of train is reduced from 60km/h at the same time as it travels a distance of 450 m, If the reduction in speed is uniform , find how much further it will travel (approx) before coming to rest? Answer is 30m but how? See

2. Math

Dominick is in charge of ordering supplies for harry's hamburger stand. hamburger buns come in packs of 12 and frozen hamburger patties come in packages of 20. he must have the same amount of rolls as patties. What is the least

3. Chemistry

The amount of energy released by burning a fuel source, measured in energy per mass, is called the fuel value. If all the energy obtained from burning 1.28 pounds of methane (fuel value is 11.97 kcal/g) is used to heat 127.0 kg of

4. physics

A crate sits on wooden horizontal surface (a wooden floor). The figure shows a top view of this looking down onto the crate (gravity would be acting into the page). Man one and man two apply forces F1 and F2, at angles of θ1 and

1. Physics

A 0.003 0-kg lead bullet is traveling at a speed of 240 m/s when it embeds in a block of ice at 0°C. If all the heat generated goes into melting ice, what quantity of ice is melted? (Lf = 80 kcal/kg, the specific heat of lead =

2. Physics

A crate sets on wooden horizontal surface (a wooden floor). The figure shows a top view of this looking down onto the crate (gravity would be acting into the page). Man one and man two apply forces F1 and F2, at angles of θ1 and

3. Statistics

A survey is taken among customers of a fast-food restaurant to determine preference for hamburger or chicken. Of 200 respondents selected, 75 were children and 125 were adults. 120 preferred hamburger and 80 preferred chicken. 55

4. Int.Science

How much energy is needed to heat and melt 3.0 kg of copper initially at 83°C? Be mindful of significant figure rules for both multiplication and addition. 450 kcal 430 kcal 280 kcal 130 kcal