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### Calc heat functions

Posted: Tue Feb 09, 2016 2:18 pm
When do you know when to use q=-q, mcdeltaT=-mcdeltaT, or q=ndeltaH + mcdeltaT????

### Re: Calc heat functions

Posted: Tue Feb 09, 2016 8:12 pm
q=-q just means that the heat is being lost/gained by a certain component and gained/lost by another component. You would use mC$\Delta T$ and/or n$\Delta H$ depending on whether or not the components in question are going through phase changes, with which you use n$\Delta H$, or are just simply increasing the temperature (ie. liquid going from 273K>373K) use mC$\Delta T$. If both a phase change and an increase in temperature are occurring use both.