Heat Math Worksheet (First Exposure) Init 4/10/2014 by Daniel R. Barnes Q = m  T Cp Q = m  H  T = T f - T i Gas Liquid Solid -  Hvap  Hvap  Hfus  Hfus NOTE: Figure 17.9 on page 520 is in error. It says “-  Hcond and –  Hsolid,” but it the minus signs don’t belong there. Either that or I’m a monkey’s uncle.  Hcond  Hsolid

... solve q = m  T Cp problems (Solving for T) 17. A corn cob is heated up in boiling water to a temperature of 100 o C. The corn cob has a mass of 400 g and absorbed 16,000 cal of heat from the boiling water. What was the original temperature of the corn cob? Assume that the specific heat of the corn cob is 1 cal/g o C. Tf = 100 o C SKIP TO ANSWER m = 400 gq = 16,000 calTi = ? o C Cp = 1 cal/g o C  T = Tf – Ti = ?q = m  T Cp m Cp  T = 16,000 cal (400 g)(1 cal/g o C) = 40 o C =  T Ti = Tf –  T = 100 o C – 40 o C= 60 o C = Ti C = ?Q = ?T = ?m = ?

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