Question

The U.S. Military provides personnel on deployment with fuel bars to heat up their meals. A fuel bar provides 380.0 kJ of energy, and 73% of that energy can be transferred to food. How many ounces of water could be heated by one fuel bar to brew coffee in the field? The initial temperature of the water is 16.0°C and it needs to be heated to boiling at 100.0°C.

Answer 1

Step-by-step explanation:

380 x 10³ J

73% of 380 x 10³ = 277.4 x 10³ J

mass of water = m gram

heat used to boil water = m x 4.2 x ( 100 - 16 )

= 352.8 m = 277.4 x 10³

m = 786.3 g

1 gram = .0352 ounce

786.3 gram = 786.3 x .0352 ounce

= 27.68 ounce .