31. Commercial cold packs consist of solid ammonium nitrate and water. NH&NO;, a

Question

31. Commercial cold packs consist of solid ammonium nitrate and water. NH&NO;, abbs ssolved in 30 × 102 J of heat of water at per gram dissolved in water. In a coffee-cup calorimeter, 4.40 g NH,NO, is di 21.0 °C. What is the final temperature of the sol 4.18 J/g K a. 3.3°C b. 17.7°C c. 20.2 °C d. 20.9 °C 100.0 g of water at ution? Assume that the solution has a specific heat capacity of e. 24.3 °C 32. When 14.2 g KBr is dissolved in 100.0 g of water in a coffee-cup calorimeter, the temperature drops from 28.88 to 23.38 °C what is thee solution has a specific heat capacity of 4.18 J/g K a. 28.6 J/g b. 185 J/g nthalpy change per gram of KBr dissolved in the water? Assume that the C. 263 J/g d. 326 J/g e. 2.63 x 10 J/g

Explanation / Answer

Ans 31:

Total heat absorbed by NH4NO3 = 4.40 x 3.30 x 102

= 1452 J

Q = m .c .delta T

1452 = 100.0 x 4.18 x Delta T

Delta T = 3.3 oC

So the final temperature of the solution will be 21.0 + 3.3 = 24.3oC

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