Write the equation for the CHANGE in FREE ENERGY. Show whether the sign for each term...
Write the equation for the CHANGE in FREE ENERGY. Show whether the sign for each term will be +/-. How does the MAGNITUDE of the ENTROPY CHANGE (T) compare with the MAGNITUDE of CHANGE in ENTHALPY (H, which represents a larger change in E)?
+ (∆G) = - (∆H) – (-T∆S); T∆S > ∆H (I don't know if what I'm doing here is correct?)
Homework Answers
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Write the equation for the CHANGE in FREE ENERGY. Show whether
the sign for each term...
4. When methane is transferred from benzene to water methane(benzene) methane(H,0) the free-energy change is positive,...
4. When methane is transferred from benzene to water methane(benzene) methane(H,0) the free-energy change is positive, but the enthalpy change is negative. What does this imply about the entropy change for the reaction? What do the signs of the free-energy change and the entropy change imply about the spontane- ity of the reaction? Does your answer make "chemical sense," that is, are hy- drocarbons soluble in water?
free energy enthal Name Entropy (S) The second factor involved in determining whether or not a...
free energy enthal
Name Entropy (S) The second factor involved in determining whether or not a process is spontaneous is the change in randomness or entropy (AS). Entropy is represented by the symbol S. Again, experience can help us understand the relationship between entropy and spontaneous processes. If we look at the two drawings below, we can predict which picture represents the stack of marbles "before and after they are bumped. We expect the stack of marbles (less random; lower...
Imagine a process that leaves the Gibbs free energy unchanged, at constant temperature T=300K. If the...
Imagine a process that leaves the Gibbs free energy unchanged, at constant temperature T=300K. If the enthalpy change in the process was 10 Joules, what is the entropy change, in SI units? (Use can use the formula G = H -TS)
Calculate the Entropy of the reaction equilibrium between 2NO2 - N2O4 given the equation: Delta G...
Calculate the Entropy of the reaction equilibrium between 2NO2 - N2O4 given the equation: Delta G = Delta H - T Delta S where: Enthalpy = -47.5 Kj/mol Gibbs free energy = -3.59 Kj/mol Temperature = 298K
Question 5 The spontaneity of a reaction depends both on the enthalpy change, Delta H, and...
Question 5 The spontaneity of a reaction depends both on the enthalpy change, Delta H, and entropy change, Delta S. Reactions that release energy produce more stable products, and the universe tends toward disorder. Thus, an exothermic reaction with a positive entropy change will always be spontaneous. Mathematically, this relationship can be represented as where Delta G is the change in Gibbs free energy and T is the Kelvin temperature. If Delta G is negative, then the reaction is spontaneous....
Consider the Conservation of Energy Equation: where E is energy in [kJ is heat in [kJ,...
Consider the Conservation of Energy Equation: where E is energy in [kJ is heat in [kJ, W is work in kJ is mass in [kg], h is enthalpy in [kJ/kg], V is velocity in [m/s], g is gravitational acceleration is m/s2] and z is height in [m]. Taking the derivative of a variable with respect time time is simply dividing the base variable unit by time. Determine, in base units (kg], [m], [s) the following: a) The units for the...
Thermodynamics Practice Problems 1. Predict the sign of AS.(positive or negative) for the following reactions a...
Thermodynamics Practice Problems 1. Predict the sign of AS.(positive or negative) for the following reactions a 2 Mg(s) +,(@) 2 Mgo (s) AS b. CH206(s) → 2C,H,OH(I) + 2003(g) AS c. 2 NH3(g) + CO2(g) → H2O(l) + NH CONH3(aq) AS d. Cu(s) (at 100°C) → Cu(s) (at 25°C) AS 2. Which two variables can indicate if a reaction is spontaneous or not? 3. The second law of thermodynamics tells us that: a Energy is conserved. b. The entropy of...
solve The heat energy associated with a change in temperature that does not involve a change...
solve
The heat energy associated with a change in temperature that does not involve a change in phase is given by -msAT where q is heat in joules, mis mass in grams, s is specific heat in joules per gram-degree Celsius, J/(g·°C). and AT is the temperature change in degrees Celsius. The heat energy associated with a change in phase at constant temperature is given by where q is heat in joules, m is mass in grams, and ? H...
What is the standard Gibbs free energy for the transformation of diamond to graphite at 298 K? Cdiamond?Cgraphite Exp...
What is the standard Gibbs free energy for the transformation of diamond to graphite at 298 K? Cdiamond?Cgraphite Express your answer to three significant figures and include the appropriate units. Gibbs free energy is a measure of the spontaneity of a chemical reaction. It is the chemical potential for a reaction, which is minimized at equilibrium. It is defined as G=H?TS Elemental carbon usually exists in one of two forms: graphite or diamond. It is generally believed that diamonds last...
Calculate the change in Gibbs free energy at standard conditions (TSS) and the equilibrium constant for...
Calculate the change in Gibbs free energy at standard conditions (TSS) and the equilibrium constant for each of the following reactions. (a) CH4(g) + H2O(g) equilibrium reaction arrow CO(g) + 3 H2(g); ?H° = +205.9 kJ, ?S° = +214.7 J/K ?G° 141.9 Correct: Your answer is correct. kJ K (b) CaCO3(s) equilibrium reaction arrow CaO(s) + CO2(g); ?H° = +179.2 kJ, ?S° = +160.2 J/K ?G° 131.5 Correct: Your answer is correct. kJ K
4. When methane is transferred from benzene to water methane(benzene) methane(H,0) the free-energy change is positive, but the enthalpy change is negative. What does this imply about the entropy change for the reaction? What do the signs of the free-energy change and the entropy change imply about the spontane- ity of the reaction? Does your answer make "chemical sense," that is, are hy- drocarbons soluble in water?
free energy enthal
Name Entropy (S) The second factor involved in determining whether or not a process is spontaneous is the change in randomness or entropy (AS). Entropy is represented by the symbol S. Again, experience can help us understand the relationship between entropy and spontaneous processes. If we look at the two drawings below, we can predict which picture represents the stack of marbles "before and after they are bumped. We expect the stack of marbles (less random; lower...
Question 5 The spontaneity of a reaction depends both on the enthalpy change, Delta H, and entropy change, Delta S. Reactions that release energy produce more stable products, and the universe tends toward disorder. Thus, an exothermic reaction with a positive entropy change will always be spontaneous. Mathematically, this relationship can be represented as where Delta G is the change in Gibbs free energy and T is the Kelvin temperature. If Delta G is negative, then the reaction is spontaneous....
Consider the Conservation of Energy Equation: where E is energy in [kJ is heat in [kJ, W is work in kJ is mass in [kg], h is enthalpy in [kJ/kg], V is velocity in [m/s], g is gravitational acceleration is m/s2] and z is height in [m]. Taking the derivative of a variable with respect time time is simply dividing the base variable unit by time. Determine, in base units (kg], [m], [s) the following: a) The units for the...
Thermodynamics Practice Problems 1. Predict the sign of AS.(positive or negative) for the following reactions a 2 Mg(s) +,(@) 2 Mgo (s) AS b. CH206(s) → 2C,H,OH(I) + 2003(g) AS c. 2 NH3(g) + CO2(g) → H2O(l) + NH CONH3(aq) AS d. Cu(s) (at 100°C) → Cu(s) (at 25°C) AS 2. Which two variables can indicate if a reaction is spontaneous or not? 3. The second law of thermodynamics tells us that: a Energy is conserved. b. The entropy of...
solve
The heat energy associated with a change in temperature that does not involve a change in phase is given by -msAT where q is heat in joules, mis mass in grams, s is specific heat in joules per gram-degree Celsius, J/(g·°C). and AT is the temperature change in degrees Celsius. The heat energy associated with a change in phase at constant temperature is given by where q is heat in joules, m is mass in grams, and ? H...
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