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5 Cards in this Set
- Front
- Back
Why does N2 have a lower boiling point than O2?
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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)
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How to determine the number of moles present
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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 |
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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 |
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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 |
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Calculate the concentration of protons in solution with pH = 6.0
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pH = –log[H3O+]
[H3O+] = 10^–pH [H3O+] = 10^–6 |