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Calculate the wavelength in nm of the emitted photon when an electron drops from the n=4 to the n=2 level in the hydrogen atom. The answer needs to be in in nanometers (nm), if not the answer will be incorrect. You need to write only the numerical answer do not write the units. I nm = 1x10-9m n R Using Hess's law, calculate the enthalpy change for the following reaction: 2C(s) + H2(g) C2H2(g) AH° = ? kJ/mol Given the following thermochemical equations: C2H2 (g) + 5/2 O2(g) 2CO2(g) + H2O(c) 4H° = - 1299.5 kJ/mol ((s) + O2(g) - CO2(g) H° = - 393.5 kJ/mol H2(g) + 1/202(9)-H2O(8) H° = - 285.8 kJ/mol From the standard enthalpies of formation shown below, calculate the enthalpy change for the following reaction: The answer needs to be in in kj/mol, if not the answer will be incorrect. You need to write only the numerical answer do not write the units. C5H12(1+902(g)-6CO2(g)+6H2O(D) A H° rxn =? kJ/mol - AH,°(H2O(8)=== = - 241.8 kJ/mol AH,°[H2O(D) = - 285.8 kJ/mol - kJ/mol AH,°[CO2(g)] = - 393.5 kJ/mol = AH,°(03(8)] = 142.2 kJ/mol

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