Answer is: volume will be 12.847 mL.
Boyle's Law: the pressure volume law - volume of a given amount of gas held varies inversely with the applied pressure when the temperature and mass are constant.
p₁ = 225 torr ÷ 760 torr/atm.
p₁ = 0.296 atm; starting pressure.
V₁ = 250 mL.
p₂ = 5.76 atm; final pressure.
p₁V₁ = p₂V₂.
0.296 atm · 250 mL = 5.76 atm · V₂.
V₂ = 0.296 atm · 250 mL / 5.76 atm.
V₂ = 12.847 mL ÷ 1000 ml/L.
V₂ = = 0.01284 L.