Given the molecular masses of the following elements: H: 1 Da, C: 12 Da, N: 14 Da, O: 16 Da, which element is the most abundant in Glutamate at pH 7.0 by weight?

Question 4 options:

1)

Oxygen

Nitrogen

Hydrogen

Carbon

At a pH of 7, Glutamate or Glutamic acid would be negatively charged, so the number of H's would be 9, not 10 or 8. That is the only thing that will change at different pH's. Not sure what the weights have to do with the problem.

5(12)=???? # C's

4(16)=???? # O's
1(14)=???? # N's

I should have clarified. Not sure why you couldn't really figure this out on your own.

To find out which element is the most abundant in Glutamate at pH 7.0 by weight, we need to consider the molecular formula of Glutamate and calculate the relative molar masses of all the elements present.

The molecular formula of Glutamate is C5H9NO4.

To calculate the relative molar mass of Glutamate, we need to add up the relative molar masses of all the atoms present in the formula.

Relative molar mass of C (carbon) = 12 Da
Relative molar mass of H (hydrogen) = 1 Da
Relative molar mass of N (nitrogen) = 14 Da
Relative molar mass of O (oxygen) = 16 Da

So, let's calculate the relative molar mass of Glutamate:
Relative molar mass of Glutamate = (5 * Carbon) + (9 * Hydrogen) + Nitrogen + (4 * Oxygen)
= (5 * 12 Da) + (9 * 1 Da) + 14 Da + (4 * 16 Da)
= 60 Da + 9 Da + 14 Da + 64 Da
= 147 Da

Now, to find the weight percentage of each element, we divide the molar mass of each element by the total molar mass of Glutamate and multiply it by 100.

Weight percentage of Carbon = (5 * 12 Da) / 147 Da * 100
= 60 Da / 147 Da * 100
≈ 40.82%

Weight percentage of Hydrogen = (9 * 1 Da) / 147 Da * 100
= 9 Da / 147 Da * 100
≈ 6.12%

Weight percentage of Nitrogen = 14 Da / 147 Da * 100
≈ 9.52%

Weight percentage of Oxygen = (4 * 16 Da) / 147 Da * 100
= 64 Da / 147 Da * 100
≈ 43.54%

Comparing the weight percentages, we can see that Oxygen is the most abundant element in Glutamate at pH 7.0 by weight, with a percentage of approximately 43.54%. Therefore, the correct answer is:

Oxygen