500.0 mL of a gas is collected at 745.0 mm Hg. what what will the volume be at standard pressure

This is an application of Boyle's law:

P₁V₁ = P₂V₂. we don't have to convert volume and pressure to standard forms. we can even use the pressure with mmHg

1 atm = 760 mmHg

V₂ = P₁V₁ / P₂ = 745 x 500 / 760 = 490 ml

Note that here we assume constant temperature