Answer:
4.5 moles of H2O. 
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
C2H5OH + 3O2 —> 2CO2 + 3H2O
From the balanced equation above, 
1 moles of C2H5OH reacted to produce 3 moles of H2O. 
Finally, we shall determine the number of mole of H2O produced by the reaction of 1.5 moles of C2H5OH. This can be obtained as follow:
From the balanced equation above, 
1 moles of C2H5OH reacted to produce 3 moles of H2O. 
Therefore, 1.5 moles of C2H5OH will react to produce = 1.5 × 3/ 1 = 4.5 moles of H2O. 
Thus, 4.5 moles of H2O will be produced.