Insulin is a protein used to regulate blood sugar levels in many mammals. In hum

Question

Insulin is a protein used to regulate blood sugar levels in many mammals. In humans, the active form of this protein consists of two covalently bonded chains and contains six sulfur atoms per molecule. A combustion analysis done on a 50.0-g sample of insulin produced 3.34 g of SO2.

What is the molar mass of human insulin?

Insulin is a protein used to regulate blood sugar levels in many mammals. In humans, the active form of this protein consists of two covalently bonded chains and contains six sulfur atoms per molecule. A combustion analysis done on a 50.0-g sample of insulin produced 3.34 g of SO2.

What is the molar mass of human insulin?

Explanation / Answer

1st calculate number of atoms of S present in 50.0 g sampl
number of moles of SO2 = mass of SO2 / molar mass
= 3.34/64
=0.0522 mol

number of atoms of S = number of molecules of SO2
= 0.0522 mol * 6022*10^23
= 3.143*10^22 atoms

number of protein = number of S/ 6
= (3.143*10^22)/6
=5.24*10^21

moles of protein in 50.0 g,
n = 5.24*10^21 / (6.022*10^23) = 8.70*10^-3 mol

molar mass = mass/number of moles
= 50.0/(8.70*10^-3 )
= 5750 g

Answer: 5750 g

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