Answered: Use the information provided to…

Living By Chemistry: First Edition Textbook

1st Edition

ISBN:9781559539418

Author:Angelica Stacy

Publisher:Angelica Stacy

ChapterU5: Fire: Energy , Thermodynamics, And Oxidation-reduction

SectionU5.5: The Heat Is On: Specific Heat Capacity

Problem 1TAI

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Question

Use the information provided to calculate the quantity of heat (in kJ) required to convert 56.0735 g of substance A from an initial temperature of 54.2ºC to a final temperature of -6.279ºC. Report your answer to the tenths place and do not include units. Do not include a sign in your answer. The molar mass of the substance is 31.9 g/mol.

melting point of A = 1.892ºC		heat of fusion = 10.69 kJ/mol
boiling point of A = 107.8ºC		heat of vaporization = 88.29 kJ/mol

	solid	liquid	gas
specific heat (J/gºC)	2.045	4.416	6.403

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This question is answered by using the simple concept calculation of the heat using the heat capacities and the enthalpy of fusion in a stepwise manner.

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