An ideal heat engine withdraws 10.00 kJ of heat from the hot reservoir at 330 K, and generates 3.00 J of work. What is the temperature of the cold reservoir? Answer: [231 K]
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An ideal heat engine withdraws 10.00 kJ of heat from the hot reservoir at 330 K, and generates 3.00 J of work. What is the temperature of the cold reservoir?
Answer: [231 K]
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- When 2.9 mol N2 is heated at a constant pressure of 3.00 atm, its temperature increases from 298 K to 345 K. Given that the molar heat capacity of N2 at constant pressure is 29.125 J K-1mol-1, calculate ΔU. answer in kJ.The molar enthalpy of fusion of NaCl is 30.21 kJ/mol at its melting point. How much thermal energy will be transferred into the system when 10.00 g NaCl melts? Answer: 5.169 kJ Show the work as to how the above number was determined.After 250 kJ of heat is added to a system, the internal energy of the system increases by 200 kJ. The external pressure remains constant during the process. What is q, w, ΔH and ΔE? ( Please type answer note write by hend )
- Suppose that 120 g of water and 150 g of ethanol, which are at 5 °C and in different containers, are heated in the same heat source that supplies 8 kJ/min, until the alcohol reaches 25 °C. (Consider: specific heat of water is 1 cal/g °C and of ethanol is 0.6 cal/g °C). Answer: a) How long and at what temperature will the water reach until there is the same amount of heat that the system containing ethanol absorbed when it reached 25 °C? b) If the two systems are heated during the same period, theoretically which liquid should indicate a higher temperature? Explain in detail. c) Explain how interaction forces influence the thermal capacity and specific heat of materials.Compute the specific heat capacity for an unknown metal when a 25.0-g cube of the metal initially at 95.6o C is carefully put into an insulated container containing 150.0 g of water initially at 23.2o C and at equilibrium the final T of the water is 24.8o (The specific heat capacity of water is 4.184 J/g oC)When gasoline burns in an automobile engine, the heat released (316 J) causes the products CO2 and H2O to expand, which pushes the pistons outward. Excess heat is removed by the car’s cooling system. If the work associated with the expanding gases is equal to 453 J, how much is the change in internal energy of the gases? If answer is negative, include sign, e. g. -1000. No need to add positive sign if answer is positive, e.g. 1000.
- Heat is added to a system, and the system dose 52 J of work. If the internal energy increase by 14 J, how much heat was added to the system? Show procedure and the final resultAnswer all parts (A, B, & C) A) A gas, while expanding, absorbs 1250 J of heat and does 2.43 kJ of work. What is Delta U for the gas? B) What is the value of w for an ideal gas expanding reversibly and isothermally if 2.00 mol at 300.0 K and 3.00 atm expand from 6.00L to a final pressure of 1.20 atm? C) A sample of a gas occupies a volume of 51.3 mL. As it expands, it does 131.6 J of work on its surroundings at a constant pressure of 783 Torr. What is the final volume of the gas?When gasoline burns in an automobile engine, the heat released (312 J) causes the products CO2 and H2O to expand, which pushes the pistons outward. Excess heat is removed by the car’s cooling system. If the work associated with the expanding gases is equal to 441 J, how much is the change in internal energy of the piston? If answer is negative, include sign, e. g. -1000. No need to add positive sign if answer is positive, e.g. 1000.
- please help i have no idea A 578−g piece of copper tubing is heated to 89.5°C and placed in an insulated vessel containing 159 g of water at 22.8°C. Assuming no loss of water and a heat capacity for the vessel of 10.0 J/°C, what is the final temperature of the system (c of copper = 0.387 J/g·°C)?Calculate the change in entropy (in J/K) when 400 mL of water at 33.8 ⁰C is heated to 55 ⁰C at constant pressure. Specific heat capacity of water at constant pressure is 4.183 J/g-K. Density of water at different temperature is presented (use this table only). Answer Format: [2 decimalsHow much heat in kJ, does it take to heat a 5 kg block of iron (specific heat capacity = 0.449 J/g degrees celsius) from 25 degrees celsius to 292 degrees celsius? Please answer with a clear explanation and steps!