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

Multiple Choice

Oxygen can be produced in the laboratory by the following reaction: 2KClO₃(s) $\rightarrow$ 2KCl(s) + 3O₂(g)
How many moles of potassium chlorate are needed to produce 2.75 L of oxygen,collected over water at 37 ^$\circ$ C and 94.9 kPa? The vapor pressure of water at 37 ^$\circ$ C is
6.28 kPa.

A) 0.142
B) 6.75 * 10^-2
C) 7.20 * 10^-2
D) 6.30 * 10^-2
E) 0.189