Down here the lab procedure and data you need them to get perfect answers. And i

Question

Down here the lab procedure and data you need them to get perfect answers.
And if possible please answer this also. Thank you. Postlaboratory Problems-Experiment 4 - Density, Ac Graphing curacy, Precision and ses (see Problem 3 to As density is an intensive property, it is very useful for identification purposes (see below). Density is also a valuable unit conversion for converting volume to mass or mass volume. The density of ethanol at 20°C is 0.789 gmL 1. a. Calculate the mass of 25.0 mL of ethanol. b. Suggest a situation where weighing may be preferable to a volume measurement. c. Calculate the volume of 25.0 g of ethanol. d. Suggest a situation where a volume measurement may be preferable to weighing. 2. Grams and centimeters in the metric system have been defined so that the density of water at 398 is exactly i. At 200, the density of water is 0.9982 gmL, what percent error results from the assumption that the density of water is 1.000 g/mL at 20°C? % error (estimate-actual), actual X1 3. Suggest simple laboratory tests you could use to distinguish acetone, carbon tetrachloride, cyclohexane, ethyl ether and ethanol. Appendix 1 might be helpful. you can distinguish some from eth you Can distingwsh Some from thers with thei es wit. A waterahen Folubilites, fur example acetone mixes winy afer Some the others dnst cavbon te tvachride ts.. Sa lub I e in alcohol

Explanation / Answer

Density of Ethanol = 0.789 g/ml
Temp = 20 degree Celsius = 293 K

a) Density = mass/ volume
= 0.789 g/ml = mass/ 25 ml
= mass = 19.725 grams

b) Weighting is preferable over volume measurement when we require an accurate measueremnt upto certain decimal places .Weight can be measured upto a large number of decimal places.

c) Density = Mass/ Volume
= 0.789 g/ml = 25 / Volume
= Volume = 31.68 ml

d) Volume will be preferable where the instruments cannot measure more than two decimal places

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