S12_1252_Exam_2_Key

Awhatisthestrongestintermolecularforceineachsample

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Unformatted text preview: f dissolved particles, so the stronger ion‐ dipole forces in the NaCl solution will draw water more strongly to make the solution more dilute. +1 more particles or IMFs 4 2 A 3. Consider a pure methanol (CH3OH) sample, and a LiNO3/methanol solution. (a) What is the strongest intermolecular force in each sample? +2 each, all or nothing hydrogen LiNO3/CH3OH ion‐dipole pure CH3OH 4 bonding (b) If each of sample is left open to the atmosphere, which sample will evaporate faster? Describe why, being sure to reference the relative strengths of the interactions identified in part (a). +2 The pure methanol will evaporate faster. The ion‐dipole forces in the solution are stronger than the hydrogen bonding in the pure solvent. +2 These strong intermolecular forces will prevent molecules of methanol from evaporating as readily, and + the Li and NO3 ions will take up space on the surface of the solution to prevent evaporation. +2 6 4. Consider the reaction 2 N2O5(g) 4 NO2(g) + O2(g). If the rate of decomposition of N2O5 is 1.910‐5 M/s, what is the rate of formation of NO2? You must show or justify your work. ‐5 +2 setup or explanation (1/2)(1.9 10 M N2O5/s) = +(1/4)([NO2]/t) According to stoichiometry, NO2 appears twice as fast as N2O5 disappears. [NO2] =...
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