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Use bond energies to calculate ΔHrxn for the following reaction: N2(g)+3H2(g)→2NH3(g)? Use bond energies to calculate the enthalpy of combustion of one mole of methanol in kJ per mole methanol.? Find the area between a large loop and the enclosed small loop of the curve: r = 4 + 8 cos(3θ)? Find the equation of the line tangent to the function at the given point. I'm not able to get the right answer. please help!? 2272.59 is what percent of 5,353.04?