Exhibit 5(a)

May 2, 2008

E. I. du Pont de Nemours and Company
1007 Market Street
Wilmington, Delaware 19898

Sir/Madam:

     Reference is made to this Registration Statement on Form S-8 being filed by you with the Securities and Exchange Commission, relating to one hundred thousand (100,000) shares of E. I. du Pont de Nemours and Company (hereinafter called “the Company”) $0.30 par value Common Stock (“Common Stock”). It is my opinion that:

     (a) the Company is duly organized and existing under the laws of the State of Delaware; and

     (b) all shares of Common Stock so registered are or will when sold, be legally issued, fully paid and nonassessable.

     I hereby consent to the use of this opinion in connection with the above-mentioned Registration Statement.

Very truly yours,
 

/s/ Stacey J. Mobley  

Stacey J. Mobley 

Senior Vice President and Chief Administrative Officer
and General Counsel