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Use average bond energies to estimate the energy released when 60.0gCH4 undergoes complete combustion: You can find average bond energy values in Appendix 4 of your text. CH4(g)+2O2(g)CO2(g)+2H2O(g) Use the following information to calculate the amount of heat involved in the complete reaction of 7.30g of carbon to form PbCO3(s) in reaction 4 . Be sure to give the proper sign (positive or negative) with your answer. 1st attempt Hrxn4=?kJ