An exothermic reaction occurs with a delta S degree of -78.4 J K^-1 mol. What mu

Question

An exothermic reaction occurs with a delta S degree of -78.4 J K^-1 mol. What must the value of enthalpy be less than in the system for the reaction to be spontaneous at -10 degree C? Please give your answer in kJ mor^-1. Do NOT input the units. Give your answer to ONE decimal place. For example, if your answer is 12.62581, please input 12.6. If you need to input a negative value please use the hyphen followed directly by the number, NO SPACE. Do not use the underscore ("_") For example, if your answer is -15.1611, please input -15.2. Which of the following lists contain all intensive state variables? Pressure, Volume, Mass, Temperature Pressure, Mass Density, Heat, Temperature Pressure, Temperature, Molar Volume, Work Pressure, Molar Volume, Temperature, Mass Density All of these None of these

Explanation / Answer

G = H – TS

H -G = TS

= -78.4 J K-1 mol-1* 263 K

= -20619.2 J/ mol

= 20.6 kJ / mol

Intensive properties:

The properties of a substance which are not depend on the extent of the sample mean amount of the substance in the sample are known as intensive properties. Such as , temperature, pressure etc.

The correct answer is

Pressure, mass density , heat, temperature.

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