Calculate the final Temperature (Kelvin) required to change the volume of 100 L of Helium at 256 K to 150 L, assuming the pressure is constant.

T = 384 K

Explanation: For this problem we will use Charles Law for gases. The formula is expressed as the ratio of volume per unit temperature having a constant pressure.

V1 / T1 = V2 / T2 derive to find the new Temperature T2

T2 = V2 T1 / V1

= 150 L ( 256 K ) / 100 L

= 384 K

Cancel out the units of Liters so the remaining unit is in Kelvin.

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.