Hydrogen gas was cooled from 150c to 50c. its new volume is 75.0 ml. what was its original volume

From the information given, the hydrogen gas was cooled from a temperature of 150 °C to 50 °C. The final volume of the gas after being cooled came to 75ml. To find out its original volume, we need to apply Charles law which is expressed as : V1 / T1 = V2 / T2 Where V1 is original volume Where T1 is original temperature Where V2 is the final volume Where T2 is the final temperature. We need V1 so V1 = (V2 * T1) : T2 V1 = (75 * 150) : 50 V1 = 225 ml Original volume of the gas was 225 ml