4 Bond enthalpies

 

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Oxford Textbook Pages : 135 - 137

CGP Revision Guide Pages : 70

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Show Specification Ref : 3.2.1f

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Question 1 / 2

AQA Jan 2013 Paper 2 Q6 do not write outside the box hydrazine n h decomposes in an exothermic reaction hydrazine also reacts exothermically with hydrogen peroxide when used as a rocket fuel a write an equation for the decomposition of hydrazine into ammonia and nitrogen only mark b state the meaning of the term mean bond enthalpy marks c some mean bond enthalpies are given in the table n h n n n n o h o o mean bond enthalpy kj mol use these data to calculate the enthalpy change for the gas phase reaction between hydrazine and hydrogen peroxide n n o o h h h o h marks turn over wmp jan chem
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Question 2 / 2

AQA Jun 2015 Paper 5 Q2 do not write outside the box table contains some bond enthalpy data bond bond enthalpy kj mol table h h o o h o a the value for the h o bond enthalpy in table is a mean bond enthalpy state the meaning of the term mean bond enthalpy for the h o bond marks b use the bond enthalpies in table to calculate a value for the enthalpy of formation of water in the gas phase marks wmp jun chem do not write outside the box c the standard enthalpy of combustion of hydrogen forming water in the gas phase is almost the same as the correct answer to question b c i suggest one reason why you would expect the standard enthalpy of combustion of hydrogen to be the same as the answer to question b mark c ii suggest one reason why you would expect the standard enthalpy of combustion of hydrogen to differ slightly from the answer to question b mark turn over for the next question turn over wmp jun chem
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