Help with understanding how to figure out the amount of heat to boil away water.

[Mtray524]

1. The problem statement, all variables and given/know

2300 grams of water is heated. If this water starts at a temperature of 17 degrees Celsius, what amount of heat is needed to boil away all of this water? Note that the specific heat of water is 1 calorie per gram per degree Celsius, the Heat of vaporization of water is 540 calories per gram, and water boils at 100 degrees Celsius.

The Attempt at a Solution

I figured that this would be the best formule for me to use Q = c m ΔT, and Qv = m Lv .

Since water boils at 100 degrees celsius, I assumed that I should subtract 100-17 to get 83 degrees as the differnce in temperature.

Can I please get assistance with understanding this probelm.

 

[edgepflow]

Actually, you are on the right track. Use your two formulas. The total heat is the sum of the two.