Use the Bond Enthalpies Given to Estimate the Heat Released

question 28

Multiple Choice

Use the bond enthalpies given to estimate the heat released when ethene,CH₂=CH₂,reacts with hydrogen to give CH₃CH₃.Bond enthalpies (kJmol^1) : C-H,412; C-C,348; C=C,612; C-Br,276; H-H,436.

• A)124 kJ  mol ^{ 1}
• B)342 kJ  mol ^{ 1}
• C)288 kJ  mol ^{ 1}
• D)148 kJ  mol ^{ 1}
• E)560 kJ  mol ^{ 1}

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