Final answer:
According to Gay-Lussac's law, the pressure of a gas is directly proportional to its temperature at constant volume. Therefore, the new temperature of the gas is 500 °C.
Step-by-step explanation:
According to Gay-Lussac's law, at constant volume, the pressure of a gas is directly proportional to its temperature. This can be expressed as P/T = constant.
In this case, the initial pressure is 450 mmHg and the initial temperature is 0.0 °C. To find the new temperature, we can set up the following equation:
(450 mmHg)/(0.0 °C) = (500 mmHg)/(T)
Simplifying the equation, we find T = 500 °C.