Final answer:
Boyle's Law is used to calculate the problem involving the expansion of gas from 2.30L at a pressure of 225kPa to a volume of 10.0L, as it deals with pressure-volume changes at constant temperature.
Step-by-step explanation:
The law that would be used to calculate the problem of a gas expanding from a volume of 2.30L at a pressure of 225kPa to a volume of 10.0L is Boyle's Law. This law is applied because the problem deals with the relationship between the pressure and the volume of a gas while the temperature and the amount of gas are held constant. Boyle's Law states that the product of the pressure and volume of a given mass of confined gas is constant as long as the temperature is unchanged. This is mathematically expressed as P1 × V1 = P2 × V2, where P1 and V1 are the initial pressure and volume, and P2 and V2 are the final pressure and volume respectively.
In contrast, Charles' Law relates a gas's volume and temperature at constant pressure, and Gay-Lussac's Law states that the pressure of a given mass of gas varies directly with the absolute temperature of the gas when the volume is kept constant.