A chemical reaction takes place in a container of cross-sectional area 50.0 cm². As a result of the reaction, a piston is pushed out through 15 cm against an external pressure of 121 kPa. Calculate the work done by the system.
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- The Dieterici equation of state for one mole of gas is p=RTe-aVRTV-b Where a and b are constants determined experimentally. For NH3g, a = 10.91 atm. L2 and b = 0.0401 L. Plot the pressure of the gas as the volume of 1.00 mol of NH3g expands from 22.4 L to 50.0 L at 273 K, and numerically determine the work done by the gas by measuring the area under the curve.1. A chemical reaction takes place in a container fitted with a piston of cross-sectional area 75.0 cm2 . As a result of the reaction, the piston is pushed out through 25.0 cm against an external pressure of 150 kPa. Calculate the work done by the system.Nitrogen gas stored in a flexible container expanded from a volume of 500 dm3 to a volume of 600 dm3 at a constant external pressure of 101.3 kPa upon absorbing 35.5 kJ of heat. How much is the change in the internal energy of the gas?
- A chemical reaction takes place in a container fitted with a piston of cross-sectional area 20cm2. As a result of the reaction, the gas undergoes a compression, the piston is displaced by 5cm (toward the bottom of the container), pushed by an external pressure of 105Pa. Calculate the work.A laboratory animal exercised on a treadmill, which, through pulleys, raised a mass of 200 g through 1.55 m. At the same time, the animal lost 5.0 J of energy as heat. Disregarding all other losses and regarding the animal as a closed system, what is its change in internal energy?The enthalpy of a system is given by the equation H=U+PV where U is the internal energy, P=pressure, and V=volume. In addition, the internal energy, U=Q+W, where Q is the heat and W is the work. Suppose we want to find the rate of change in the enthalpy at constant pressure of 1.25 atm, what is the value when heat is absorbed by the system at a rate of 45 J/s and work is done by the system at a rate of 100 J/s, when the change of volume is rated at 35X10^-5 m^3/s?3. What is the change in enthalpy of the system with respect to time?
- In a certain ideal heat engine, 10.00 kJ of heat is withdrawn from the hot source at 273 K and 3.00 kJ of work is generated. What is the temperature of the cold sink?1.) 3 BTU OF HEAT ENERGY WAS REMOVED FROM A SYSTEM. THE SYSTEM WAS COMPRESSED AT A CONSTANT PRESSURE OF 1770.8 TORR FROM 1000mL TO 12.15gallons. (1liter = 0.264172gal.) a.) HOW MUCH WORK WAS PERFORMED? in BTU b.) CALCULATE THE CHANGE IN INTERNAL ENERGY OF THE SYSTEM. in BTUA sample of a serum of mass 26.6 g is cooled from 290 K to 275 K at constant pressure by the extraction of 1.05 kJ of energy as heat. Calculate q and ΔH and estimate the heat capacity of the sample. report here the heat capacity = ________ J/k/g. 3 sig. number
- In the calibration step of a thermochemistry experiment, a current of 124 mA, from a 24.0 V source was allowed to flow through the electrical heater for 219 s and was found to result in an increase in the temperature of the calorimeter and its contents of +1.39 K. Given that the energy supplied by an electrical circuit is the voltage multiplied by the current, multiplied by the time, what is the heat capacity of the calorimeter and its contents? Answer: 469 J K-1a sample of 98g of pure sulfuric acid is dissolved in 2.0 kg of water in an insulated vessel at 15°C, and thetemperature rises rapidly because of the process of forming the solution. The reaction is summarized in theequation H2SO4(l) -> H+(aq) + HSO4 –(aq). Estimate the temperature change assuming that the heat capacityof the solution is 4.0 J/gK and the heat capacity of the vessel is 300 J/K.Calculate DH and DStot when two copper blocks, each of mass 10.0 kg, one at 100°C and the other at 0°C, are placed in contact in an isolated container. The specific heat capacity of copper is 0.385 J K−1 g−1 and may be assumed constant over the temperature range involved.