Asked by Kale
Substance A has a normal fusion point of ‑10.0 oC, an enthalpy of fusion = 150.0 J g^-1; specific heats for the solid and the liquid are 3.00 and 6.20 J g^-1 oC^-1, respectively. How much heat, in J, is required to change 150 grams of A from a solid at –40.0 oC to a liquid at +70.0 oC?
Answers
Answered by
DrBob222
There are two formula to use and you can progress from the solid, liquid, gas.
When you change the phase, you go with q = mass x heat fusion (at the melting point) or q = mass x heat vap at the boiling point.
When the phase is not changing, you go with q = mass x specific heat x (Tfinal-Tinitial).
This applies in the solid phase, the liquid phase, and the gaseous phase.
Then total q = sum of the individual qs. Post your work if you get stuck.
When you change the phase, you go with q = mass x heat fusion (at the melting point) or q = mass x heat vap at the boiling point.
When the phase is not changing, you go with q = mass x specific heat x (Tfinal-Tinitial).
This applies in the solid phase, the liquid phase, and the gaseous phase.
Then total q = sum of the individual qs. Post your work if you get stuck.
There are no AI answers yet. The ability to request AI answers is coming soon!
Submit Your Answer
We prioritize human answers over AI answers.
If you are human, and you can answer this question, please submit your answer.