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From the following data, C(s , graphi...

From the following data,
C(s , graphite) `+ O_(2) (g) to CO_(2) (g)`
`H_(2) (g) + (1)/(2) O_(2) (g) to H_(2) O (l)`
`Delta H_("reaction")^(@) = -286` kJ/mole
`2 C_(2) H_(6) (g) + 7O_(2) (g) to 4 CO_(2) (g) + 6H_(2) O (l) Delta H_("reaction")^(@) = -3120` kJ/mole
Calculate the standard enthalpy of formation of `C_(2) H_(6) (g)` ( in kJ/mole)

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`-85` kJ/mole
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From the following data , C_("s , graphite") + O_(2(g)) to CO_(2 (g)) Delta H^(@) = - 393 . 5 kJ /mole H_(2) (g) + 1//2 O_(2) (g) to H_(2)O (l) Delta H^(@) = -286 kJ/mole 2C_(2) H_(6) (g) + 7O_(2) (g) to 4 CO_(2 (g)) + 6H_(2)O (l) Delta H^(@) = - 3120 kJ/mole Calculate the standard enthalpy of formation of C_(2) H_(6) (g) (in kJ/mole)

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