q1 = heat to move T of water from 43 C to 100 = mass x speicif heat liquid water x (
Tf - Ti). Tf is final T (in this case 100 and Ti is initial T (in this case 43 C.)
Then you DO, definitely, need the delta H vap for water.
q2 = heat to evaporate water = mass x delta Hvap
q3 = heat to move T of steam from 100 C to 140 C = mass x specific heat steam x (Tf - Ti) =
The total is q1 + q2 + q3.
Judging from your post, I think you knew all of this. You will need to either look up delta Hvap or ask your teacher tomorrow. By the way, note the correct spelling of Celsius.
My teacher provided info about a worksheet of problems.
Special Heat of water: 4.184
Special Heat of Steam: 2.09
Special Heat of Ice: 1.8
Based on this info, and the notes we have taken on phase changes, we are supposed to find out how much energy is needed to change certain substances.
I thought, however, that in order to create a phase change, one must use the q=m,delta,Hfusion or m,delta,Hvap. How can I perform these equations without the Hvap/fusion info provided?!
Question 4, for example asks...
...60g of water at 43 degrees celcius to steam at 140 degrees celcius.
Help please?!?!?
1 answer