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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)


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