What is the entropy change when 315 J of energy is reversibly transferred to a sample of water at 25°C?

What is the entropy change when 315 J of energy is reversibly transferred to a sample...
What is the entropy change in J/K to the universe when a dry ice (CO2) sculpture weighing 386.1 g sublimates on a table top at 21.7 °C and the process occurs reversibly? The temperatures of the dry ice solid and vapour are both -78.5 °C, and the heat of sublimation of dry ice is 21.6 kJ/mol. (2 marks) (Give answer to 3 significant figures.)
Calculate the entropy change of the system and of the su water freeze reversibly at 1.00 atm. The freezing temper the specific enthalpy change of fusion is -79.7 cal g at this pressure is 0.00 C while 8 pts)
Calculate the change in entropy (in J/K) that occurs when a sample containing 2.00 moles of water is heated from 80.00 °C to 110.0 °C at 1 atm pressure. Molar Heat Capacity H20(I) = 75.3 JK' molt H20(9) = 36.4 JK' moi Enthalpy of Vaporization at 100 °C = 40.7 kJ moi? -1 Answer:
Calculate the change in entropy (in J/K) that occurs when a sample containing 2.00 moles of water is heated from 10.00°C to 300.0 °C at 1 atm pressure. Molar Heat Capacity H2O(1) = 75.3 JK' moi? H2O(g) = 36.4 JK' mol Enthalpy of Vaporization at 100 °C = 40.7 kJ mol .-1 -1 Answer:
The change in entropy of a 1.50 kg block of copper whose temperature is increased reversibly from 310 K to 390 K is: (The specific heat of copper is 386 J/kg 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?
A sample of n moles of a monatomic ideal gas is expanded isothermally and reversibly at a constant temperature T from a volume V to 3V. Note that since the temperature of the gas is constant, the internal energy will remain constant. a) Write an expression for the change in entropy ΔS for the system. b) The sample has 7 moles of gas and is kept at a temperature of 305 K. The volume is changed from 0.065 m3 to...
When a system of acetone undergoes a phase change from liquid to vapor, the entropy change (ΔS) for the system is 95 J/K and it requires 31.3 kJ of energy to be transferred into the system from the surroundings. (CH3)2CO (l) → (CH3)2CO (g) ΔH = 31.3kJ a. Calculate the overall entropy change (ΔSuniverse) for this process at 65.0°C. b. Briefly discuss whether or not this process would be spontaneous or nonspontaneous at this temperature.
What is the entropy change of the universe (in J K-1)when 2.00 mol of liquid water at 0 °C freezes in a freezer compartment whose temperature is -15 °C? Assume the freezer is a perfect insulator. (AHfus = 6.01 kJ mol-1 for water) Select one: O a. +90.6 O b. +46.6 C. -2.6 O d. -44.0 o e. +2.6
What is the change in entropy of 100 g of water when it is heated from room temperature (20 °C) to body temperature (37 °C)? Use p.m-75.5 J K i mol l