Which of these functional groups is found in all amino acids? -NH2 -OH =O -PO42-
1 answer:
Answer : The correct option is,
Explanation :
Amino acid : The acid that contains two functional groups that are carboxylic group, and ammine group,
.
When the two or more that two amino acids join together with the help of peptide bond, they produces polypeptide chain or protein.
The bond present between the two amino acid is called a peptide bond.
The peptide bond is a chemical bond that is formed between the two molecules when the nitrogen of one amino acid react with the carbon of another amino acid by releasing a water molecule. This is a dehydration synthesis or condensation reaction.
From this we conclude that, only two functional groups carboxylic group, and ammine group,
are present in all amino acids.
Hence, the correct option is,
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<u>Answer:</u> The mass percent of potassium bromide in the mixture is 9.996%
<u>Explanation:</u>
- To calculate the number of moles, we use the equation:
.....(1)
<u>For lead (II) bromide:</u>
Given mass of lead (II) bromide = 0.7822 g
Molar mass of lead (II) bromide = 367 g/mol
Putting values in equation 1, we get:
- The chemical equation for the reaction of lead (II) nitrate and potassium bromide follows:
By Stoichiometry of the reaction:
1 mole of lead (II) bromide is produced from 2 moles of potassium bromide
So, 0.0021 moles of lead (II) bromide will be produced from = of potassium bromide
- Now, calculating the mass of potassium bromide by using equation 1, we get:
Molar mass of KBr = 119 g/mol
Moles of KBr = 0.0042 moles
Putting values in equation 1, we get:
- To calculate the percentage composition of KBr in the mixture, we use the equation:
Mass of mixture = 5.000 g
Mass of KBr = 0.4998 g
Putting values in above equation, we get:
Hence, the percent by mass of KBr in the mixture is 9.996 %