Oxygen Can Be Produced in the Laboratory by the Reaction $\rightarrow$

Oxygen can be produced in the laboratory by the reaction: 2KClO₃(s) $\rightarrow$ 2KCl(s) + 3O₂(g)
How many moles of potassium chlorate are needed to produce 257 mL of oxygen,collected over water at 14 $\degree$ C and 97.6 kPa? The vapor pressure of water at 14 $\degree$ C is
1.60 kPa.

A) 6.89 *10 ^{- 3}
B) 7.00 *10 ^{- 3}
C) 7.12 *10 ^{- 3}
D) 2.06 *10 ^{- 3}
E) 1.55*10 ^{- 3}