1. Determine the R f value for the Br - ion in 80% acetone. 2. Which halide ions
ID: 806795 • Letter: 1
Question
1. Determine the Rf value for the Br- ion in 80% acetone.
2. Which halide ions are present in the unknown?
3. Determine the molar mass for each of the alkanes (pentane, hexane, heptane, octane).
4.List the intermolecular forces present in ethanol, acetone and ethyl acetate.
5.A student studies the effect of intermolecular forces on vapor pressure by immersing a filter paper covered temperature probe in a test tube containing hexane. The initial temperature is 24.0?C and the temperature after 45 seconds is 8.4?C. Calculate the rate of evaporation on ?C/s.
Explanation / Answer
Answer
1. Rf determined from the plot is 22 cm.
2. Chloride and Iodide
3. Molar mass of alkanes: alkanes - CnH(2n+2), so molar mass = 14*n + 2, n is number of carbon
pentane = 14*5 + 2 = 72; Hexane = 86, heptane = 100 and octane = 114
4. Since all three molecules are polar, there is these intermolecular forces are present: dipole-dipole interaction, hydrogen binding and van-Der Waal's interaction.
5. rate of evaporation = (24-8.4)/45 = 0.35 oC/s
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