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yaroslaw [1]
3 years ago
6

The side chain of ________ has a pKa in the physiological pH range and is therefore often involved in proton transfer during enz

ymatic catalysis. The side chain of ________ has a pKa in the physiological pH range and is therefore often involved in proton transfer during enzymatic catalysis. His Glu Asp Arg

Chemistry
1 answer:
I am Lyosha [343]3 years ago
5 0

Answer:

Histidine (his)

Explanation:

Histidine (his), Arginine (arg), Aspartic acic (asp) and Glutamic acid (glu) have 3 acidic hidrogens each one, but only his has one physiological in the pH range.

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When 2.0 mol of methanol is dissolved in 45 grams of water, what is the mole fraction of methanol
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The mole fraction of methanol in the mixture is 0.444

We'll begin by calculating the number of mole of water.

  • Mass of water = 45 g
  • Molar mass of water = 18 g/mol
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Mole = mass / molar mass

Mole of water = 45 / 18

Mole of water = 2.5 moles

Finally, we shall determine the mole fraction of methanol.

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Mole fraction of methanol =?

Mole fraction = mole / total mole

Mole fraction of methanol = 2 / 4.5

Mole fraction of methanol = 0.444

Thus, the mole fraction of methanol is 0.444

Learn more about mole fraction:

brainly.com/question/15444997

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