Chemistry

1)Buttermilk has 9 grams of protein and 12 grams of carbohydrate per cup (237ml). Estimate the concentration in mol/L of protein using the fact that the average protein is 300 amino acids long and the average amino acid has a mass of 110 amu.

2)Lactose (MW:342 amu) makes up the vast majority of the carbohydrate. Calculate the molarity of lactose in buttermilk and compare it to that of protein.

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  3. 👁 1,967
  1. 1. avg molar mass = 110 x 399 = 33,000.
    mols protein = grams/molar mass. You know grams and molar mass, solve for mols.

    M = mols/L. You know mols and L, solve for M.

    2. See #1.

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  2. .001151

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  3. I .001151 correct? I ended up with 2.72

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  4. 1.15

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  5. Thank you!!

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  6. #2 is the same as #1
    just it is 12 g
    and it is molar mass of 342
    so it will be 0.148

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  7. do you have to convert the 9grams to liters in order to answer the first question for the protein amount? i

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  8. The answer is 0.148.

    I got the answer wrong with above,andthey told me this was.

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  9. 1) 6.52 *10^20 (Trust me on this one)

    2) No idea :(

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