Question 12 (1 point) The formation reaction evidence for three compounds are shown below. C(s)+O2(g)CO2(g)H2(g)+1/2O2(g)H2O(g)7C(s)+7H2(g)C7H14(l)H=393.5kJH=241.8kJH=+115.0kJ The standard enthalpy change for the combustion of C7H14(1) is: abcd.e kJ - Input the value for abcd.e in the blank below. Include a positive or negative sign in your answer: eg 1147.8 or +1147.8 - Do not include units Is the reaction endothermic or exothermic? - write exothermic or endothermic in the blank