Hess's law to calculate enthalpy of combustion. Help I'm clueless!?

  • Thread starter Thread starter Rachel S
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Rachel S

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The following equation shows the combustion of ethane.

2C2H6 + 7O2 ---> 4CO2 +6H2O

Use Hess's law to calculate the enthalpy of combustion for ethane, C2h6, from these data.

C2H4(g) +3O2(g) --> 2CO2(g) + 2H2O(g)
/\ Hc= -1323 kJ/mol

C2H4(g) + H2(g) --> C2H6(g)
/\ Hr = -137 kJ/mol

H2(g) + 1/2 O2(g) --> H2O(g)
/\ Hf degrees = -242 kJ/mol
 
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