Chapter 9: Q9DQ (page 343)
Hess’s law is really just another statement of the first law of thermodynamics. Explain.
Both Hess’s law and the first law of thermodynamics state the conversion of energy content for a system or reaction, therefore Hess’s law is considered another statement of the first law of thermodynamics.
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Question : The bombardier beetle uses an explosive discharge as a defensive measure. The chemical reaction involved is the oxidation of hydroquinone by hydrogen peroxide to produce quinone and water:
Calculate ∆H for this reaction from the following data:
The reactionis the last step in the commercial production of sulfuric acid. The enthalpy change for this reaction is -227 kJ. In the design of a sulfuric acid plant, is it necessary to provide for heating or cooling of the reaction mixture? Explain your answer.
A swimming pool, 10.0 m by 4.0 m, is filled with water to a depth of 3.0 m at a temperature of 20.2oC. How much energy is required to raise the temperature of the water to 24.6oC?
Assume that of energy is needed to heat a home. If this energy is derived from the combustion of methane , what volume of methane, measured at STP, must be burned?
Question : Given the following data:
2 (g)3role="math" localid="1648705821921" (g) ∆H = -427 kJ
O2(g)2O(g) ∆H = 495 kJ
NO(g) + (g)N (g) + (g) ∆H = -199 kJ
calculate ∆H for the reaction
NO(g) + O(g)NO2 (g)
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