Did I get these correctly?

Chemistry

1 answer:

Luda [366]3 years ago

4 0

Those are both correct! great job, keep up the good work (-:

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Give the number of protons, electrons and neutrons in one atom of Carbon.

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Answer:

6 protons, 6 neutrons, and 6 electrons.

Explanation:

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What is the net charge of the peptide arg-ala-phe-leu at ph 8?

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The structure of this oligopeptide is attached:

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From the picture we can see that N terminus charge is +1
Also Arginine is considered as basic amino acid with charge +1
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At pH = 8, the whose pKa are less than pH will be deprotonated and the net charge will be +1

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Mass Molar of $Ca_{3} (PO_4)_2$
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P = 2*31= 62 amu
O = (16*4)*2 = 64*2 = 128 amu
--------------------------------------
Mass Molar of $Ca_{3} (PO_4)_2$ = 120 + 62 + 128 = 310 g/mol

Therefore: <span>What is the gram formula mass of Ca3(PO4)2 ?
</span>Answer: 310 grams

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