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Chemistry / Chemistry: The Molecular Nature of Matter and Change - Standalone book 7 / Chapter 6 / Problem 6.83

Chemistry: The Molecular Nature of Matter and Change - Standalone book | 7th Edition | ISBN: 9780073511177 | Authors: Martin Silberberg Dr., Patricia Amateis Professor

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The common lead-acid car battery produces a large burst of current, even at low

Chapter 6, Problem 6.83

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QUESTION:

The common lead-acid car battery produces a large burst of current, even at low temperatures, and is rechargeable. The reaction that occurs while recharging a dead battery is 2PbSO4(s) 1 2H2O(l) - Pb(s) 1 PbO2(s) 1 2H2SO4(l) (a) Use DH8 f values from Appendix B to calculate DH8 rxn. (b) Use the following equations to check your answer to part (a): (1) Pb(s) 1 PbO2(s) 1 2SO3(g) - 2PbSO4(s) DHrxn 8 5 2768 kJ (2) SO3(g) 1 H2O(l) - H2SO4(l) DHrxn 8 5 2132 kJ

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QUESTION:

The common lead-acid car battery produces a large burst of current, even at low temperatures, and is rechargeable. The reaction that occurs while recharging a dead battery is 2PbSO4(s) 1 2H2O(l) - Pb(s) 1 PbO2(s) 1 2H2SO4(l) (a) Use DH8 f values from Appendix B to calculate DH8 rxn. (b) Use the following equations to check your answer to part (a): (1) Pb(s) 1 PbO2(s) 1 2SO3(g) - 2PbSO4(s) DHrxn 8 5 2768 kJ (2) SO3(g) 1 H2O(l) - H2SO4(l) DHrxn 8 5 2132 kJ

ANSWER:

Step 1 of 3

The value of gives the change in enthalpy during the reaction. The number of moles plays a vital role in enthalpy change. The heat of formation is used to calculate enthalpy change.

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