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Calculate amount of heat released?

Answers:1   |   LastAnswerAt:2011.04  

Question
visitor
hellsing 
Asked at 2011.04.20 23:11:36
Calculate amount of heat released from the reaction which is carried out in an aluminium calorimeter with a mass of 3087g and contain 170.0 mL of H2O. The initial temperature of the calorimeter is 25.0°C and at the end of the reaction, the temperature is increased to 27.8°C.
Specific heat capacity of Al = 0.558 J/g°C
Specific heat capacity of H2O = 4.18 J/g°C
Water density = 1.0 g/mL
answer andyp114  Answered at 2011.04.20 23:11:36
Assuming the water and Aluminium are heated from 25.0 to 27.8

Energy balance:
Energy in = Energy out + Energy change
Reaction energy = (Assume 0 energy lost to surroundings) + Energy change

Reaction energy
= Energy change
=[ mass x heat capacity x change in temperature(water) ]+ [ (mass x heat capacity x change in temperature (Al) ]
= mass ov water = 170ml x 1g/ml = 170.0g

so reaction energy
= (170.0g x 4.18J/gC x 2.8) + (3087g x 0.558 J/gC x 2.8)
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