You are throwing a dinner party and decide to prepare instant Chinese noodles (chicken flavor) for all your guests. From the cooking instruction on the back of the package, you determine that you will need to bring 50 cups of water to a boil for your noodles. You will be cooking on a propane stove, which isn't very efficient. In fact, only 80 % of the heat generated at the burner is actually used to heat the water in the pot. You would like to know how much money you will have to spend on propane to bring the water to a boil up from a room temperature of 77 ? F. Note: you will turn off the propane right when the water begins to boil.
Actual values:
Propane has a heating value of 19930 Btu/lbm
You can expect to buy propane at $3.90/gallon.
The density of propane is 4.114 lbm/gallon.
Assume the density of the water is a constant 61.0 lbm/ft3
a) How much water will need to be heated? Pounds
b) How much heat is required to raise the temperature of the water to boiling? Btu
c) How much propane will be consumed? Gallons
d) How much is the cost of that much propane? $