INSTANT COLD PACK ammonium nitrate Inner bag of water SINGLE US E ONLY Figure 5.16 An instant cold pack consists of a bag containing solid ammonium nitrate and a second bag of water. When the bag of water is broken, the pack becomes cold because the dissolution of ammonium nitrate is an endothermic process that removes thermal energy from the water. The cold pack then removes thermal energy from your body. Heat Flow in an Instant Ice Pack When solid ammonium nitrate dissolves in water, the solution becomes cold. This is the basis for an “instant ice pack" (Figure 5.16). When 3.21 g of solid NH¼NO3 dissolves in 50.0 g of water at 24.9 °C in a calorimeter, the temperature decreases to 20.3 °C. Calculate the value of q for this reaction and explain the meaning of its arithmetic sign. State any assumptions that you made.
INSTANT COLD PACK ammonium nitrate Inner bag of water SINGLE US E ONLY Figure 5.16 An instant cold pack consists of a bag containing solid ammonium nitrate and a second bag of water. When the bag of water is broken, the pack becomes cold because the dissolution of ammonium nitrate is an endothermic process that removes thermal energy from the water. The cold pack then removes thermal energy from your body. Heat Flow in an Instant Ice Pack When solid ammonium nitrate dissolves in water, the solution becomes cold. This is the basis for an “instant ice pack" (Figure 5.16). When 3.21 g of solid NH¼NO3 dissolves in 50.0 g of water at 24.9 °C in a calorimeter, the temperature decreases to 20.3 °C. Calculate the value of q for this reaction and explain the meaning of its arithmetic sign. State any assumptions that you made.
Chapter10: Energy
Section: Chapter Questions
Problem 14A
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Question
If the 3.21 g of NH4NO3 in the given problem were dissolved in 100.0 g of water under the same conditions, how much would the temperature change? Explain your answer.
Transcribed Image Text:INSTANT
COLD PACK
ammonium nitrate
Inner bag of water
SINGLE US E ONLY
Figure 5.16 An instant cold pack consists of a bag containing solid ammonium nitrate and a second bag of
water. When the bag of water is broken, the pack becomes cold because the dissolution of ammonium
nitrate is an endothermic process that removes thermal energy from the water. The cold pack then removes
thermal energy from your body.
Transcribed Image Text:Heat Flow in an Instant Ice Pack
When solid ammonium nitrate dissolves in water, the solution becomes cold. This is the basis for an “instant
ice pack" (Figure 5.16). When 3.21 g of solid NH¼NO3 dissolves in 50.0 g of water at 24.9 °C in a
calorimeter, the temperature decreases to 20.3 °C.
Calculate the value of q for this reaction and explain the meaning of its arithmetic sign. State any
assumptions that you made.
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