calorimetry confusion

[marcusho]

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on a temp vs q graph, as something is increasing in q and T, you can calculate heat change by q=mc(delta T)

so when something is going through a phase change say solid->liquid, that part of the graph of temperature vs q is a horizontal line since there is no change in temperature.. what would be the equation for that heat absorbed?

kaplan says q=m*heat of fusion
but my homie chad on his lecture video says q = n*heat of fusion

so which one do you use? mass or # of moles? 🙁

thanx in advance

 

[AndyK]

on a temp vs q graph, as something is increasing in q and T, you can calculate heat change by q=mc(delta T)

so when something is going through a phase change say solid->liquid, that part of the graph of temperature vs q is a horizontal line since there is no change in temperature.. what would be the equation for that heat absorbed?

kaplan says q=m*heat of fusion
but my homie chad on his lecture video says q = n*heat of fusion

so which one do you use? mass or # of moles? 🙁

thanx in advance

It can be either mass or moles depending on if you're given kJ/gram or kJ/mol... usually it's the latter though.