A Gas occupies 525mL at a pressure of 85.0kPa. What would the volume of the gas be at a pressure of 65.0kPa

Boyle's law gives the relationship between pressure and volume of gas.

It states that at a constant temperature, the pressure of gas is inversely proportional to volume of gas for a fixed amount of gas.

PV = k

where P - pressure, V - volume and k - constant

substituting these values into the equation;

85.0 kPa x 525 mL = 65.0 kPa x V

V = 687 mL