CHEM 121 Lecture Notes - Lecture 15: Coffee Cup, Silver Nitrate, Silver Chloride
13 Jul 2015
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2. 00 moles of a monatomic ideal gas are taken from state a (pa = 2. 50 atm, va = 10. 0l) to state b (pb = 2. 50 atm, vb = 30. 0l). 75. 0 l*atm x 101. 3j/l*atm = 7597 j = 7. 60 kj. Different substances respond differently to being heated. Calorimeter: device used to experimentally determine the heat of reaction. Heat capacity of a substance: c = heat absorbed/increase in temp. Using heat capacity: q = c(j degree-1) x t. Using specific heat capacity: q = c(j *g-1*degree-1) x mass(g) x t. Using molar heat capacity: q = c(j*mol-1*degree-1) x n(# of moles) x t. 150. 0 g of lead is heated to 100. 0 oc then added to 50. 0 g of water at 22. 0 oc. The final temperature of the water and the lead is 28. 8 oc. If the specific heat of water is 4. 18. Lower value means easier to heat up (less energy needed)
