Thermodynamics of Chemistry?

Hi.. just trying to figure out a homework problem.. if i could understand how to do this one.. it might be helpful on the rest.. any help is greatly appreciated!!!

Sydney

The heat of combustion of gaseous butane is -2658 KJ/mol and the heat of combustion of liquid butane is -2635 KJ/mol when in both cases, all products are gases.

a.) Write a balenced chemical equation for the combustion of gaseous butane.

b.) How many grams of gaseous butane combust when 1550 KJ of heat are produced?

c.) What is the magnitude and sign of the molar heat of vaporization of butane? Explain your answer using Hess’s law. Is your sign for the heat of vaporization realistic? Explain.

(any help is appreciated thanx)

Thermodynamics of Chemistry?

Thermodynamics of Chemistry?

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