Rubbing alcohol is used to disinfect wounds and surfaces. It has the following properties: Melting point: -88.5C Boiling point: 82.3C Latent heat of fusion: 8.94 x 104 J/kg Latent heat of vaporization: 6.66 x 105J/kg Specific Heat Capacities: Solid: 1.95 x 10³ J/kg C Liquid: 2.37 x 10³ J/kg C Vapor: 2.74 x 10³ J/kg C a) You decide to heat up 250 g of rubbing alcohol in a pot, after having cooled it to -5C in the freezer. How much energy will it take to heat the rubbing alcohol to 90C? [4] Include a heating curve graph in your submitted solutions [1] b) You let the 250 g of rubbing alcohol cool in the pot, then add a 50 g piece of copper at -2C and close the lid. After leaving the lid closed for awhile, you measure the final temperature as 41C. What was the initial temperature of the rubbing alcohol? (specific heat of copper is 390 J/kg°C) [3] For your answers below enter 3 significant digits ONLY (no units here; include them instead in full solutions).

College Physics
10th Edition
ISBN:9781285737027
Author:Raymond A. Serway, Chris Vuille
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Chapter11: Energy In Thermal Processes
Section: Chapter Questions
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Rubbing alcohol is used to disinfect wounds and surfaces. It has the following
properties:
Melting point: -88.5C
Boiling point: 82.3C
Latent heat of fusion: 8.94 x 104 J/kg
Latent heat of vaporization: 6.66 x 105J/kg
Specific Heat Capacities:
Solid: 1.95 x 10³ J/kg C
Liquid: 2.37 x 10³ J/kg C
Vapor: 2.74 x 10³ J/kg C
a) You decide to heat up 250 g of rubbing alcohol in a pot, after having cooled it to
-5C in the freezer. How much energy will it take to heat the rubbing alcohol to 90C?
[4]
Include a heating curve graph in your submitted solutions [1]
b) You let the 250 g of rubbing alcohol cool in the pot, then add a 50 g piece of
copper at -2C and close the lid. After leaving the lid closed for awhile, you measure
the final temperature as 41C. What was the initial temperature of the rubbing
alcohol? (specific heat of copper is 390 J/kg°C) [3]
For your answers below enter 3 significant digits ONLY (no units here; include them
instead in full solutions).
Ex: Actual answer: 12.035 You enter: 12.0 or Actual answer: 1234 You enter:
1230
Transcribed Image Text:Rubbing alcohol is used to disinfect wounds and surfaces. It has the following properties: Melting point: -88.5C Boiling point: 82.3C Latent heat of fusion: 8.94 x 104 J/kg Latent heat of vaporization: 6.66 x 105J/kg Specific Heat Capacities: Solid: 1.95 x 10³ J/kg C Liquid: 2.37 x 10³ J/kg C Vapor: 2.74 x 10³ J/kg C a) You decide to heat up 250 g of rubbing alcohol in a pot, after having cooled it to -5C in the freezer. How much energy will it take to heat the rubbing alcohol to 90C? [4] Include a heating curve graph in your submitted solutions [1] b) You let the 250 g of rubbing alcohol cool in the pot, then add a 50 g piece of copper at -2C and close the lid. After leaving the lid closed for awhile, you measure the final temperature as 41C. What was the initial temperature of the rubbing alcohol? (specific heat of copper is 390 J/kg°C) [3] For your answers below enter 3 significant digits ONLY (no units here; include them instead in full solutions). Ex: Actual answer: 12.035 You enter: 12.0 or Actual answer: 1234 You enter: 1230
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