A molecule has a heat of formation of - 91.8 kJ/mol. At 25 C, what would be the value of the entropy change of the surroundings ?
a. |
298 K |
|
b. |
308 J/K |
|
c. |
111J/K |
|
d. |
- 197 J/K |
A molecule has a heat of formation of - 91.8 kJ/mol. At 25 C, what would...
Questions A37- A39 relate to a phase change ('pc") for which ApcFl- +25 kJ mol and pS+50 J - mol, independent of temperature. A37. What is the value of the temperature, in K, at which the phase change occurs? a) 0.002 b) 0.5 c) 2 A38. For the temperature at which the phase change occurs, what is the value, in J K-1 mol1, of the entropy change of the surroundings? a) 50 b) 0 c) +25 d) +50 A39. For...
The standard heat of formation for CCl4(g) is -103 kJ/mol at 298 K. Write the formation equation for CCl4(9) that goes with this value of ΔΗ. Enter carbon as C($). Use the pull-down boxes to specify states. Write fractions with a slash, such as 1/2 for one half. If a box is not needed leave it blank. Submit Answer
Thermodynamics 1) The enthalpy of vaporization of water ∆H = -25 kJ mol-1 at T = 45 °C. When water V = 15 cm3 in an open vessel evaporates at this temperature, calculate the change in entropy of the surroundings. 2) For a given reaction, ∆H = 25 kJ and ∆S = 50 J/K. Above what temperature will this reaction occur spontaneously? 3) At T = 15°C a certain protein denatures reversibly with ∆H = 30 kJ/mol. The system is...
The standard heat of formation for FeCl3(s) is -400 kJ/mol at 298 K. Write the formation equation for FeCl3(8) that goes with this value of ΔΗ. Use the pull-down boxes to specify states. Write fractions with a slash, such as 1/2 for one half. If a box is not needed leave it blank.
What is the entropy change to the surroundings when 1 mol of ice melts in someone's hand if the hand temperature is 32°C? Assume a final temperature for the water of 0°C. The heat of fusion of ice is 6.01 kJ/mol. a. -188 J/K b. -22.0 J/K c. -19.7 J/K d. +19.7 J/K e. +188 J/K
The standard heat of formation for UF6(g) is -2.11x103 kJ/mol at 298 K. Write the formation equation for UF6(g) that goes with this value of AH°. Use the pull-down boxes to specify states. Write fractions with a slash, such as 1/2 for one half. Ifa box is not needed leave it blank Submit Answer
AG,O (25°C kJ/mol) ДнР (25°C kJ/mol) So Substance (25°C J/mol-K) NaNO, (s) -467.9 -367.0 116.5 NaNO2 (s) -358.7 -284.6 103.8 Cl2O (g) CI2OS (g) PbO (s) 80.3 97.9 266.2 -212.5 -198.3 309.8 -217.32 -187.89 68.7 CI2CRO2 (I) CI2CRO2 (g) -579.5 -510.8 221.8 -538.1 -501.6 329.8 Compute the AH°, AG°, and AS° for the reaction given below at two temperatures: 298 K and 315 K. PbCl2 (s)3NaNO2(s) PbO(s)NaNO3(s) +2NO(g) +2NaCl(s) At 298 K kJ ΔΗ' is AG° is kJ J/K AS...
The heat of combustion of liquid cumene (C9H12) is -5215.5 kJ/mol at 1 atm and 298 K a) What is the energy of combustion at 1 atm and 298 K? Ecomb = kJ/mol b) Use Thermodynamic Properties to determine its heat of formation. Hf = kJ/mol
The enthalpy of vaporization of water at 100 0°C is 40.43 kJ/mol. What is the entropy change in the surroundings when one mole of water vapor condenses at 100.0°C in a large room maintained at a temperature of 20.00°C? (answer in J/K) Answer Check
4. The standard enthalpy of formation of NH3 (g) is -46.11 kJ mol-' at 298 K. Given the heat capacity data below and the data in Problem 2, calculate the standard enthalpy of formation at 1200 K Cp.m (H2 (9))/ J mol K-1 = 29.1 - (0.84 x 10- K-)T Cpm (N2 (g))/ J mol K-1 = 26.98 +(5.9 x 10-'K-!)T