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Unit 7 Lab Report - Calorimetry Evaluation

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1. A 445 g sample of ice at –58oC is heated until its temperature reaches –29oC. Find the change in heat content of the system. Q=C x P x ∆T The temperature change is −29−(−58) =29 The enthalpy change is thus 445g * (29’C) * 2.077 J/g-’C = Joules = 26.8 kJ 2. A 152 g sample of...

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  • June 13, 2022
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  • 2021/2022
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Unit 7 - Calorimetry Evaluation

1. A 445 g sample of ice at –58oC is heated until its temperature reaches –29oC. Find the change in
heat content of the system.

Q=C x P x ∆T
The temperature change is −29−(−58) =29
The enthalpy change is thus 445g * (29’C) * 2.077 J/g-’C = 271000 Joules = 26.8 kJ




2. A 152 g sample of ice at –37oC is heated until it turns into liquid water at 0oC. Find the change in
heat content of the system.

Q=C x P x ∆T+ C x m= (152x(0-(-37))x2.10)+ (332x152) = -6.23 x 104 J




3. A 218 g sample of steam at 121oC is cooled to ice at –14oC. Find the change in heat content of
the system.

Q=C x P x ∆T= 218x(-14-121)x2.10= -6.71 x 104 J




4. If 161 g of water at 85oC is cooled to ice at 0oC, find the change in heat content of the system.

Q=C x P x ∆T+ C x m = 161x(0-85)x4.184 + (333 x 161) = 110871 J




5. A 79 g sample of water at 21oC is heated until it becomes steam with a temperature of 143oC.
Find the change in heat content of the system.


Total Q=(C x P x ∆T)+ (C x m) + (C x m x ∆T)= –2.11 x 105 J



6. If a 348 g sample of steam at 127oC is cooled to 103oC, find the change in heat content of the
system.


Q=C x P x ∆T= 348x(103-127)x1.87= –1.56 x 104 J




This study source was downloaded by 100000830214522 from CourseHero.com on 06-13-2022 09:00:19 GMT -05:00


https://www.coursehero.com/file/26983985/Unit-7-Lab-Report-1docx/

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