Question

Prin hidrogenarea catalitica cu hidrogen molecular a 282,8 kg amestec de acid oleic si acid stearic cu cifra de iod I1=27,02 se obtine,dupa separarea catalizatorului,un produs cu cifra de iod I2=4,47.Care sunt concentratiile in procente molare de acid oleic,respectiv acid stearic din amestecul supus hidrogenarii?

Answer 1

100 g amestec..............27,02 g I2

282,8 kg amestec...............x

x=76,41 kg I2

282 g acid oleic........................254 g Iod

x...............................................76,41 kg iod

x=84,33 kg acid oleic

n acid oleic = 84,33/282 =0,3 kmoli 

m acid stearic = m amestec - m acid oleic = 282,8-84,33=197,47 kg

n acid stearic = 197,47/284 =0,7 kmoli

% acid oleic = 0.3/1 * 100 = 30%

% acid stearic = 0.7/1 * 100 = 70%