What is the approximate molecular weight of the protein?
a) 68,000 g/mol
b) 12,000 g/mol
c) 4,000 g/mol
d) 30,000 g/mol
e) 24,000 g/mol
500 g of an unknown protein containing 3 cobalt atoms was analyzed for cobalt composition and was found to have 7.2 grams of cobalt.?
2016-05-09 10:30 pm
回答 (1)
2016-05-09 10:51 pm
✔ 最佳答案
Molar mass of Co = 58.93 g/molNo. of moles of Co = (7.2 g) / (58.93 g/mol) = 0.1222 mol
Each protein molecule contains 3 Co atoms.
No. of moles of 500 g of protein = 0.1222 × (1/3) = 0.0407 mol
Molar mass of the protein = (500 g) / (0.0407 mol) ≈ 12,000 g/mol
...... The answer is : b) 12,000 g/mol
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