Question

can we write sodium ethoxide as NaC2H5O instead of C2H5ONa

Answer 1

C2H5ONa + CH3COCl -------CH3COOC2H5 +NaCl
It is an example of sn2 reaction where the sodium ethoxide act as a base and attack the ethanoyl chloride.The product formed is ethyl ethanoate with the formation of sodium chloride.The mechanism follows the formation of tetrahedral intermediate.with the elimination of Cl- 
so,we cant
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Answer 2

Hey user☺

Yes you can write it in the aboved mentioned way.

Mark can get deducted because while writing any compound that is ionic, the cationic part has to be written first followed by anions.
And here, Na is cation and C2H5O is anion.
Thats all.

Hope this will help☺☺