Q6. Heat change for reaction = 300 J
According to energy conservation principle, energy is neither created nor destroyed but converted from one form to another.
Heat change for reaction + heat change for water = 0
heat change for water = -(Heat change for reaction)
heat change for water = -(300 )
heat change for water = -300 J
(negative sign indicates water loses heat)
Q12. Given :
Change in internal energy, U = -400 kJ
(negative sign indicates energy is released)
Work done, w = -250 kJ
(negative sign indicates work is done by the system)
According to first law of thermodynamics,
U = q + w
where q = heat change of system
Substituting the values of U and w
-400 kJ = q + (-250 kJ)
q = -400 kJ + 250 kJ
q = -150 kJ
(negative sign indicates heat is released)
Amount of energy released as heat = 150 kJ
6. A sample of ammonium chloride dissolves in water, absorbing heat from the surrounding water and...
D) hegative and positive. 12. The mixture of gas and air inside a cylinder reacts, releasing 400 kJ of total energy. If the system does 250 kJ of work on the piston, how much energy is released as HEAT?
13. The mixture of gas and air inside a cylinder reacts, releasing 300 kJ of heat. If the system does 150 kJ of work on the piston, what is the change in total energy?
A salt dissolves in water by absorbing 1.5 kJ of heat energy from the surrounding 52.0 g of solution. If the solution is initially at 24.0°C, what is the final temperature of the solution? Csoln = 4.18 J/g·deg Please show steps
The salt ammonium chloride dissolves in water according to the reaction: NH_CI) —NH4+ (aq) + Cl(aq) (a) Calculate the standard enthalpy change AH° for this reaction, using the following data: AH NHACI() = -314.4 kJ mol-1 AHNH4+(aq) = -132.5 kJ mol-1 AH; Cr(aq) = -167.2 kJ moll kJ (b) Calculate the temperature reached by the solution formed when 36.8 g of NH4Cl is dissolved in 0.186 L of water at 23.7 °C. Approximate the heat capacity of the solution by...
The salt ammonium chloride dissolves in water according to the reaction: NH4Cl(s) NH4+(aq) + Cl-(aq) (a) Calculate the standard enthalpy change ΔH° for this reaction, using the following data: NH4Cl(s) = -314.4 kJ mol-1 NH4+(aq) = -132.5 kJ mol-1 Cl-(aq) = -167.2 kJ mol-1 kJ (b) Calculate the temperature reached by the solution formed when 35.3 g of NH4Cl is dissolved in 0.160 L of water at 24.6 °C. Approximate the heat capacity of the solution by the heat capacity...
A frictionless piston-cylinder device contains a saturated liquid-vapor mixture of water at 373K. During a constant pressure process, 600 kJ of heat is transferred to the surrounding air at 300K. Asa result, part of the water vapor contained in the cylinder condenses. Determine (1) the entropy change of the water, (2) the entropy change of the air (3) the total entropy generation during this process.
5.12 A long vertical cylinder of 100 mm bore, open at the top, contains 0.005 kg of allowed to settle to an equilibrium position. Heat energy is then supplied and the pistorn atmospheric air at 15°C. A close-fitting piston of mass 15 kg is placed in the cylinder and rises 300 mm. If friction is negligible, determine: (a) the absolute pressure of the air in the cylinder; (b) the heat energy supplied; (e) the change in internal energy of the...
When a 5.26-g sample of solid ammonium nitrate dissolves in 52.5 g of water in a coffee-cup calorimeter (see above figure) the temperature falls from 24.00 oC to 17.20 oC. Calculate H in kJ/mol NH4NO3 for the solution process. NH4NO3(s) NH4+(aq) + NO3-(aq) The specific heat of water is 4.18 J/g-K. Hsolution = _________kJ/mol NH4NO3.
The salt ammonium perchlorate dissolves in water according to the reaction: NH4ClO4(s) NH4+(aq) + ClO4-(aq) (a) Calculate the standard enthalpy change ΔH° for this reaction, using the following data: NH4ClO4(s) = -295.3 kJ mol-1 NH4+(aq) = -132.5 kJ mol-1 ClO4-(aq) = -129.3 kJ mol-1 kJ (b) Calculate the temperature reached by the solution formed when 33.9 g of NH4ClO4 is dissolved in 0.196 L of water at 23.4 °C. Approximate the heat capacity of the solution by the heat capacity...
A frictionless-piston-cylinder device contains a liquid-vapor mixture of water at 200°C. During a constant- pressure process, 500 kJ of heat is transferred to the surrounding air at 20°C. As a result, part of the water vapor contained in the cylinder condenses. a) Draw a schematic of your system including the boundary and all relevant energy transfer. (2 pts) b) Determine the entropy change of the water, in kJ/K. (3 pts) c) For the extended system (system + surroundings), write an...