water is a unique material in that the density of the solid is lower than the de
ID: 727622 • Letter: W
Question
water is a unique material in that the density of the solid is lower than the density of the liquid ( which is why ice forms at the top of a pond and why ice floats in our drinks). if the density for ice at 0 degree is 0.917 g/ml and the density for water at 0 degree is 0.999 g/ml, what is the the calculated free apace ( as % ) for each of these materials. You will need to estimate the volume of water as the sum of 2 H atoms and 1 O atom with radii of 37 and 66 pm respectively. note that you will also have to assume a quantity of water this exercise.Explanation / Answer
[(2* 4 * (37*10-10cm)3/3) + (4*(67*10-10cm)3/3)] * 6.02*1023 molecules = volume of 1 mole of atoms in cm3
V = 1.014 cm3
18.02g/mole/0.999g/mL = 18.03 cm3/mole as a liquid
18.02g/mole /0.917g/mL = 19.65 cm3/mole as ice
free space in liquid = [1 - (1.014/18.03)] * 100% = 94.4%
free space in solid = [1 - (1.014/19.65)] * 100% = 94.8%
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