1. A student weighs 30.0 mL of an unknown liquid and finds its mass to be 20.86
ID: 979436 • Letter: 1
Question
1. A student weighs 30.0 mL of an unknown liquid and finds its mass to be 20.86 g. Calculate the density of the unknown liquid. (Remember to always include units and report the answer using correct number of significant figures.)
2. A graph of mass (grams) vs volume (milliliters) of an unknown liquid resulted in a straight-line equation of y = 1.196x + 0.015. Based on the equation of the straight line, determine the density of the unknown liquid.
3. Would you expect toluene that has a chemical formula of C7H8 to be soluble in water? Explain. (Hint: think of the intermolecular forces present in each)
4. You are given an unknown liquid sample and told that it is one of the 3 possible compounds: Acetone, Diethyl ether or Methanol. You do a quick solubility test and find that the unknown is soluble in hexane (non-polar) but insoluble in water. What is the identity of the unknown? Circle the correct answer. Methanol, Acetone, Diethyl ether
Explanation / Answer
(1) Density = mass/volume
d = m/V
d = 20.86/30.0 = 0.695 g/mL
(2) density = 1.196 g/mL
Because, y = mx + c
where, m = slope = mass/volume (in the present case)
which means, density.
(3) Since toluene is nonpolar molecule, it is insoluble in water.
(4) Diethyl ether (since it a nonpolar which is insoluble in water)
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