The Thermal Decomposition of Potassium Chlorate Can Be Used to Produce

The thermal decomposition of potassium chlorate can be used to produce oxygen in the laboratory. 2KClO₃ (s) → 2KCl (s) + 3O₂ (g)
What volume (L) of O₂ gas at 25°C and 1.00 atm pressure is produced by the decomposition of 7.5 g of KClO₃ (s) ?

A) 4.5
B) 7.5
C) 2.0
D) 3.7
E) 11