a) The Iodine number (I#) is the mass of iodine that binds 100 g of fatty acid.

Question

a) The Iodine number (I#) is the mass of iodine that binds 100 g of fatty acid. An experiment shows that 1 g of the unknown fatty acid binds 0.98 g of I2.
Calculate I# for the unknown fatty acid. Show your calculations. (2 pts)

b) Establish the mathematical equation that links MI (the mass of I2 bound to the unknown fatty acids), MWI2 (the molecular weight of I2) and mI (the number of moles contained in MI). Show your reasoning. (2pts)
MI= ?

c) Establish the mathematical formula that links I#, mI, MWI2, mFA, and MWFA. Show your reasoning. Remember the equation that you have establish in part 1) c (3pts)

I# = ?

d) Establish the mathematical equation between mI, mFA and p, where p is the number of double bonds contained in the unknown fatty acid. Show your reasoning. (3 pts)

mI = ?

e) Based on the mathematical formula determined in parts c) and d), establish the mathematical formula that links I#, p, MWI2, and MWFA. Show your reasoning. (4pts)

f) Knowing that the MWI2 = 254 g.mol-1, calculate how many double bonds are contained in the unknown fatty acid. Show your calculation. Note that you may have to round up the numerical value of p. (4 pts)

Explanation / Answer

a. The index of iodine to a lipid is diiodine (I2) mass (expressed in gram) capable to set on the unsaturation (double bond more often) 100 g of fat fatty acids in contrast iodine value in him even has no unit.
1 g of this unknown fatty acid binds 0.98 g of I2.
then :
100 g of this unknown fatty acid binds 98 g of I2.
The iodine number is 98.

b. Actually

Molar mass of a compound = mass of compound / no. of moles of compound

mass of a compound = Molar mass of compound * no. of moles of compound

Here

MI = MWI2 * mI

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