Question

#4 a-c

Chemistry 167 - Mart Revised March 2010 4 2.) Calculate the yield for each isomerization reaction involving each unknown. Show your work below using units and sig, figs. Circle your answers and record the results in table 2 Unknown Unknown B: b.) Discuss the yields for unknowns A and B and give likely reasons that accounts for yowe Over or under 100%. yields being either c.) Compare the yield for the isomerization reactions involving unknowns A and B and explain anderes

Answer 1

Consider Isomerisation reaction dienone as follows: of alkane of H Suppose, practical yield = 0.8 gm Suppose we take 1 g mol starting compound.. starting product Molecular C4H10 C4H10 formula weight 58 58 Now when we take 1 gm starting compound we ger I gm product Theoretical Yleld - Igm. % Yield practical yield X 100 Theoretical yield 0.8 Xtoo lo 7. Yleid = (2 consider isomerisation F Dienone. ои th c on Suppose practical yield = 0.65 m Theoretical yleld = 1. 0 gm 7. Vield = practical yteld - Theoretical Yield 0.65 x100 X 100 1:0 I t. yield 657.

-- DATA- 6 How 7 field of unknown AA = 80% f - 7. Vield of unknown B = 65%. Therefore t rield OF B is less than A. 7. Yield of product is no more than 100% ③ There are various reasons for such decrease in percent yield. If reaction does not happens 100% that is is some reactant does not reach then yield of product becomes less. One another reason is that if starting compound is nor highly pure then t. yield decreases. Reaction condition i.e. temperature & pressure is also important because every reaction require an optimum temperature & pressure to go into pansition shate. one another reason for lower percent yield is that after reaction expaction of product & purification of product is also important. If purification does not perform with good procedure then yield of produc decreases.