Posted by **Dan** on Saturday, February 4, 2012 at 9:46pm.

How much energy (heat) is required to convert 248 g of water from 0oC to 154oC? Assume that the water begins as a liquid, that the specific heat of water is 4.184 J/g.oC over the entire liquid range, that the specific heat of steam is 1.99 J/g.oC, and the heat of vaporization of water is 40.79 kJ/mol.

- Chem -
**DrBob222**, Saturday, February 4, 2012 at 9:54pm
q1 = heat needed to raise T from zero C to 100 C for the liquid.

q1 = mass H2O x specific heat x (Tfinal-Tinitial).

q2 = heat needed to vaporize liquid water at 100 C to steam at 100 C.

q2 = mass H2O x heat vap

q3 = heat needed to raise steam from 100 C to 154 C.

q3 = mass steam x specific heat x (Tfinal-Tinitial)

Then sum q1 + q2 + q3.

Note: Be VERY careful with the units. The problem quotes different units for the specific heat. You need to use the same unit which means converting them to the same, whichever you wish. The choice may be dictated by the units you have for mass H2O; i.e., you have grams, you might need to convert that to moles if you choose to use kJ/mol for sp. h.

## Answer this Question

## Related Questions

- Chemistry - How much energy (heat) is required to convert 248 g of water from ...
- college chem - calculate the amount of energy (in kj) necessary to convert 457 g...
- chem - How much energy (in Joules) is required to heat 13.48 g of water from 10....
- chemistry - the heat of fusion water is335 J/g. The heat of evaporization of ...
- Phase Changes - The heat of fusion of water is 335 J/g, the heat of vaporization...
- Chemistry HEAT OF FUSION - What is the final temperature, in oC, after a 15.0 g ...
- chemistry - Calculate the energy in the form of heat, in kJ, required to convert...
- Physcial Science - Hey There, I have 4 questions that I am totally stumped on...
- Physcial Science - Hey There, I have 4 questions that I am totally stumped on...
- Physcial Science - Hey There, I have 4 questions that I am totally stumped on...