Nitrous oxide (N₂O) gas is widely used in automotive industries to improve engine performance. At an unknown temperature, the volume of an N₂O gas sample is 0.758 L. At constant pressure and amount of gas, the volume of the gas decreases to 0.494 L when the temperature is 30.0°C. Determine the initial temperature (in °C) of the gas.

• A. 192°C
• B. 129°C
• C. 219°C
• D. 291°C

Answer: (A)