[Valensi101]

Hydrogen (H2) is added to 0.10 mol of fat which contains only oleic acid C17H33COOH as the fatty acid component. How much hydrogen at the standard state is necessary to saturate the fat completely?

The answer is 6.72 by the way. I tried to solve it in many ways and still couldn't get it.

[AWK]

The answer fits to linolenic acid (3 double bond).

[Valensi101]

What do you mean by the answer fitting to linolenic acid (3 double bond)? I still don't understand.. 

[sjb]

The answer is 6.72 by the way. I tried to solve it in many ways and still couldn't get it.

6.72 what? Litres? Gallons (US or UK)? Beer barrels?

What do you mean by the answer fitting to linolenic acid (3 double bond)? I still don't understand.. 

How many degrees of unsaturation are there in your molecule?

[Valensi101]

@sjb: Oops sorry I forgot about that one. The unit is in litres. Emm about the degree of saturation, is it using the formula
(2C + 2 + N - X - H)/2? If so, then the degree of saturation of oleic acid is (2x18+2+0-0)/2, which is 2. Am I correct?

[sjb]

Well, (2x18+2+0-0)/2 does not equal 2, but I think I know what you mean. How many fatty acid molecules are there for each molecule of fat? How many carbon-carbon double bonds are there?

[Valensi101]

Oh sorry it's supposed to be (2x18+2+0-34)/2, my bad. Well I found out that there is only 1 carbon-carbon double bond in oleic acid. Emm to answer your first question, I don't know.. . All I know is fats are triesters of glycerol  and fatty acids..