Methane transfer: An experiment starts in a separatory funnel, with a water laye
ID: 715835 • Letter: M
Question
Methane transfer: An experiment starts in a separatory funnel, with a water layer and a benzene layer(see figure at right). Methane is added to the funnel so that it starts under standard state conditions, ie., with 1 M of methane in the aqueous layer, and 1 M of methane in the benzene layer. The system is allowed to go to equilibrium, and the concentration of methane in each layer is determined. The standard state G can be determined from the initial and final methane distribution, and the standard state &H can be determined by measuring the heat released or absorbed while equilibrating. The standard state &S can be calculated from the other two. I The thermodynamic parameters for this change (standard state->equilibrium) are given below, from your textbook. The table assumes the net direction methane moves is from water to benzene (the signs would switch if we assume the process instead is for the transfer of methane from benzene to water). Changes for Transferring H from Water to Nonpolar Solvents at 25*C J mol- 3. Under the conditions of this experiment, does methane flow more to the aqueous layer or the benzene layer? Give the evidence for your conclusion-what thermodynamic data in particular are you using to draw your conclusion? (Use numbers and units.) 4. Is the transfer of methane from water to benzene spontaneous due to the change in enthalpy, the change in entropy or both? 5. Based on math, would you say the process is driven by enthalpy or entropy? Driven" meaning the AG's sign and magnitude is mainly due to the component given.) 6. During the net transfer of methane from water to benzene, do the interactions within the system become stronger or weaker? Give your evidence for your conclusion. 7. During the net transfer of methane from water to benzene, does the disorder of the system increase or decrease? 8. Based on your prior knawledge, would you say this transfer demonstrates the hydrophobic effect? Explain (1-2 sentences)Explanation / Answer
3) Under this condition methane flow more in non polar benzene solution.
Here G =-10.9 kjmol-1 , the rxn is spontaneous
If ,G value is negative then the rxn spontaneous and easily occur in forward direction.
So methane flow in benzene solution spontaneously. We get more methane solutions in benzene.
4)In transfer methane water to benzene spontaneous depends on Gibbs free energy. If G negative then the rxn spontaneous. If G positive then the rxn is non spontaneous.
We know the equation, G= H-TS
So G depends on H and S value, the rxn spontaneous or not.
Where G =11.7-22.6=10.9 kjmol-1.
So the rxn spontaneous or not depend s both entropy and enthalpy.