Answer:
No, the correct option is: 2.0 mol of O2 remains unreacted.
Yes, the molarity of the C5H10O5 in the solution is approximately 0.206 mol/L.
the correct minimum mass of oxygen needed to burn 27 g of C3H6O is approximately 14.44 grams (rounded to three significant figures).
I don't know if my answers are correct or not.So, I hope it will help.