thermochemistry-answers

thermochemistry-answers - Specific heat capacity(a.k.a...

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Specific heat capacity (a.k.a. Specific heat) symbolized as c, units in J/g ° C It’s the heat required to raise 1 gram of a substance by 1 ° C Heat capacity calculated by c x m, units in J/ ° C It’s the heat required to raise the temperature of an object by 1 ° C. Molar heat capacity Similar to specific heat capacity, but uses moles instead of grams, units in J/mol ° C. It’s the heat required to raise the temperature of 1 mol of a substance by 1 ° C
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Answers 2. a) As calculated yesterday: 25.5 kJ b) Specific heat is 4.18 J/g ° C (pg. 151) c) Heat capacity: cm=4.18J/g ° Cx200g= 836 J/ ° C d) Molar heat capacity is c x g/mol =4.18 J/g ° C x 18 g/mol = 75.3 J/mol ° C 3. Simply using q=cm T, c= 4.18 J/g ° C, m=335 g, T=26.4-24.5= 1.9 ° C q=cm T= 4.18 J/g ° C x 335 g x 1.9 ° C = 2.7 kJ 4. We cannot determine the c for wax from this data because we did not heat the candle (no value for T). We would have to change the lab procedure if we wanted c for wax.
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1. q=cm
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This note was uploaded on 04/12/2011 for the course CHEM 1010 taught by Professor Marshall during the Spring '11 term at North Texas.

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thermochemistry-answers - Specific heat capacity(a.k.a...

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