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Feed2all p2p4u Wiziwia Watch Green Bav PaclE MTALIRR Departina Sc x MasterinaPhvsics Assic x 30 G of Drv Ice (solid co x New Tab Mastering Physics: Ch13-1 https:// session.masteringphysics.com 51559268&offset; next Chegg PHY121 Fall 2015 Signed in as ibrahim elmaghrbi Help Close Ch13 1 Problem 12.87 Resources home study q previous 10 of 10 return to assignment An experiment measures the temperature of a 240 g substance while steadily supplying heat to it. The Part A figure shows the results of the experiment. What are wi (a) the specific heat of the liquid phase and (b) the 30 minutes Express your answer using two significant figures. heat of vaporization? Figure 1 Question Figure 1 of 1 60 kg T (OC) Subm My Answers Give Up 30 g of dry 1800 quickly pu 1500 Incorrect, Try Again; 4 attempts remaining temperatu 1200 atm. The g 900 Part B atm imme 600 help Express your answer using two significant figures. What is t 300 Q (kJ) 20 40 60 80 Comment 3377 kg Expert A Scotty G. 204

Explanation / Answer

( a)

Expression for specific heat:

c = Q / m T

specific heat of the liquid phase in J/kgK

c = ( 40,000 - 20,000 ) J / 0.240kg ( 1500-300K )

= 69.44 J/kgK

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(b)

Heat of vaporization: L = Q / m

Heat of vaporization in J/kg at 1500 oC

L= 80,000 - 40,000J / 0.240 kg

= 166666.67 J/kg

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