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

Multiple Choice

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 ^$\omicron$ C and 97.6 kPa? The vapor pressure of water at 14 ^$\omicron$ 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