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Dafna1 [17]
3 years ago
13

Scientists interested in early life on Earth including the first cells and the last universal common ancestor of all three domai

ns of life are likely to get the most information from:
a. sis of two amino acids, forming a peptide bond with the release of water
b. the reaction of two monosaccharides, forming a disaccharide with the release of water
c. the reaction of a fat with glycerol, forming fatty acids with the release of water
d. the reaction of a fat, forming glycerol and fatty acids with the consumption of water
Chemistry
1 answer:
jonny [76]3 years ago
7 0

Answer: A. sis of two amino acids, forming a peptide bond with the release of water

Explanation: Molecule Evolution is a term used to explain the changes that has taken place as organisms evolve from one generation to the next.Molecular evolution is connected with the Amino acid sequence and synthesis as every ancestor of man have certain closely related or changes which must have caused evolution to take place. the formation of peptide bonds from amino acids with the release of water is the closest option Scientists can use to explain the evolution of man.

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A 10.0 g sample of an unknown liquid is vaporized at 120.0°C and 5.0 atm. The volume of the vapour is found to be 568.0 mL. The
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Answer:

molecular formula of liquid = C₈H₁₈

Explanation:

First we determine the empirical formula of the liquid:

Number of moles of each element present in the liquid = % mass / molar mass

For Carbon, (molar mass = 12.01 g/mol) : 84.2/12.01 =7.011 moles

For Hydrogen (molar mass = 1.01 g/mol) : 15.8/1.01 = 15.643

Simplest mole ratio of the elements, C : H  is given by:

C = 7.011/7.011 = 1.0

H = 15.643/7.011 = 2.23

Multiplying through with 5, C:H = 5:11

Therefore, empirical formula is C₅H₁₁

The molecular mass of the liquid is next determined:

Using PV = nRT to find the number of moles of the liquid present

P = 5.0 atm; V = 568.0 mL = 0.568 L; R = 0.082 L*atmmol⁻¹ K⁻¹; T = 273 + 120 = 393 K

n = PV/RT = (5*0.568)/0.082*393

n = 0.088 moles

Molar mass of liquid = mass/no of moles = 10.0 g/ 0.088 moles = 113.63 gmol⁻¹

Molecular formula = n(empirical formula)

Molar mass of empirical formula, C₅H₁₁ = 71 gmol⁻¹

n = molecular mass/empirical mass = 113.63/71 = 1.6

Therefore, molecular formula =  1.6*(C₅H₁₁) = C₈H₁₈

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RAM=element×its relative abudance/total abudance

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The answer is=107.96

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