Chemistry
posted by qwerty on .
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.

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. 
.001151

I .001151 correct? I ended up with 2.72

1.15

Thank you!!

#2 is the same as #1
just it is 12 g
and it is molar mass of 342
so it will be 0.148 
do you have to convert the 9grams to liters in order to answer the first question for the protein amount? i

The answer is 0.148.
I got the answer wrong with above,andthey told me this was.