write the equation?

Question

for the complete hydrogenation of the polyunsaturated fatty acid linnoleic acid,
CH3 (CH2)4CH = CHCH2CH = CH(CH(CH2)7COOH.

Answer 1

hydrogenation is addition of HCL or HBr or HI.

if linnoleic acid is your compound, just remove the double bond and add a Cl on the alpha carbon.
CH3 (CH2)4CH = CHCH2CH = CH(CH(CH2)7COOH + 2HCl
will yield

CH3 (CH2)4CHClCHCH2CHClCH(CH(CH2)7COOH

i hope you'll understand

Answer 2

Add up the number of carbons except for acid group Carbon.

For an alkane (completely hydrogenated except for acid group), the formula for solving for number of H is CnH(2n+2)

n stands for number of carbons

remember that hydrogen is added as a gas, so formula is H2. hydrogen gas will saturate all the double bonds.