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balu736 [363]
3 years ago
13

Polyesters are formed from the reaction of __________.

Chemistry
1 answer:
Mrac [35]3 years ago
4 0

Answer:

The answer is C. a diol and a dicarboxylic acid

Explanation:

Because Esterification (formation of an ester) is a process that requires an alcohol to react with a carboxylic acid.

Polyester means many ester units.

one alcohol + one carboxylic acid make one ester

thus more than one of each functional groups will make more than on ester unit.

That is why diol (2OH functional groups) + dicarboxylic acid (2 Carboxyl groups) will make polyesters.

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Degger [83]
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Lauryl alcohol is a nonelectrolyte obtained from coconut oil and is used to make detergents. A solution of 6.80 g of lauryl alco
natka813 [3]

Answer:

The approximate molar mass of lauryl alcohol is 174.08 g/m

Explanation:

An excersise to apply the colligative property of Freezing-point depression.

This is the formula: ΔT = Kf . m

First of all, think the T° of fusion of benzene → 5.5°C

ΔT = T° pure solvent - T° fusion solution

Kf for benzene: 5.12 °C/m

5.5°C - 4.5°C = 5.12 °C /m  . m

1°C /  5.12 m /°C = m

0.195 m = molality

This moles of lauryl alcohol, solute, are in 1 kg of benzene, solvent.

I have to find out in 0.2 kg.

1 kg sv ____ 0.195 moles solute

0.2 kg sv ____ (0.195 . 0.2)/1 = 0.039 moles solute

The mass for these moles is 6.80 g, so if I want to know the molar mass, I have to divide mass / moles

6.80 g/ 0.039 moles = 174.08 g/m

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3 years ago
What is an electron configuration?
Lorico [155]

Answer:

Electronic configuration, also called electronic structure, the arrangement of electrons in energy levels around an atomic nucleus.

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Question 1 of 10 What is molarity a measurement of? O A. The volume of liquid containing a dissolved substance B. The grams of a
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Answer:

D

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D. The number of moles of a dissolved substance

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Why is the Pacific Northwest receives so much precipitation?
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