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coryintheswamp
17.08.2021 •
Chemistry
Describe the differences in the TLC of the reaction mixture before heating and after heating and explain the observed change in Rf values.
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Ответ:
Apparent density of ethylene glycol 3350 = 17g/15.6mL= 1.09g/mL
Specific gravity of mixture = 1.01
Explanation:
The specific gravity of an object or substance is the ratio of the density of that object or substance to that of a reference substance usually water.
Specific gravity = density of substance/density of water
The density of a substance is the ratio of the mass of that substance to is volume.
Density = Mass/volume
Density of water 1.00 g/mL,
Apparent density of ethylene glycol 3350 = mass/volume
volume of ethylene glycol = volume of mixture - volume of water
volume of ethylene glycol = 195.6 - 180) = 15.6mL
Apparent density of ethylene glycol 3350 = 17g/15.6mL= 1.09g/mL
mass of water = density of water * volume of water
mass of water = 1.00g/mL * 180mL = 180 g
Mass of solution = mass of substance + mass of water = (17 + 180)g = 197g
Density of mixture = mass of mixture / volume of mixture
Density of mixture = 197 g / 195.6 mL = 1.01 g/mL
specific gravity of mixture = density of mixture / density of water
specific gravity of mixture = 1.01g/mL / 1.00g/mL
specific gravity of mixture = 1.01