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August 31, 2015

Homework Help: chemistry

Posted by Lena on Wednesday, March 30, 2011 at 8:52pm.

A studen is asket to calculate the amount of heat involved in changing 10.0 g of liquid bomine at room temperature (22.5 C) to vapor at 59.0 C. To do this, one must know specific heat (0.474 J/g*C), boiling point (59 C), and heat of vaporization (29.6 kJ/mol) of bromine.In addition, the following step-wise process must be followed.

a) Calculate delta H for: Br2 (l, 22.5 C) --> Br2 (l, 59.0 C)

b) Calculate delta H for: Br2 (l, 59.0 C) --> Br2 (g, 59.0 C)

c) Using Hess's law, calculate delta H for: Br2 (l, 22.5 C) --> Br2 (g, 59.0 C)

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