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### 5 Cards in this Set

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 Why does N2 have a lower boiling point than O2? Nitrogen has a lower boiling point b/c less energy is required to overcome the van der Waals forces between the smaller N2 molecules (MM 28 vs. MM 32) How to determine the number of moles present divide the mass by the molar mass e.g. # of moles of K present in 20g sample nK = mK/ MW K =(20g)/ (39.1 g/mol) = ~0.5 moles Enthalpy, (H) Entropy,(S) Gibbs Free Energy (G) Enthalpy = (ΔH <0) exothermic reaction; Spontaneous Entropy (S) = (ΔS > 0), Disorder Increases; Spontaneous Gibbs Free Energy= ΔG = ΔH – TΔS, Spontaneous if negative Determine Partial Pressure of H20 in rxn: CH4 + O2 → CO2 + H2O total pressure = 1.2 torr CH4 + 2O2 → CO2 + 2H2O PH2O = Ptotal × XH2O PH2O = 1.2 torr × 2/3 PH2O = 2.4 torr/3 PH2O = 0.8 torr Calculate the concentration of protons in solution with pH = 6.0 pH = –log[H3O+] [H3O+] = 10^–pH [H3O+] = 10^–6