An uninsulated steam pipe passes through a room in which the air and walls are at 28°C. The outside diameter of the pipe is 70 mm, and its surface temperature and emissivity are 400°F and 0.80 respectively. If the coefficient associated with free convection heat transfer from 3.
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- A diffuser is used to increase the pressure of a stream of air circulating at 6500 kg / h. The initial conditions of the inlet are 82 kPa and 197 ° C, and it exits at 115 kPa. The air speed decreases from 245 to 37 m / s as it passes through the diffuser. Calculate: b) The cross-sectional area at the outlet of the diffuser:Calculate expansion coefficient for one mole of an ideal gas at STP and SATP.An open vessel containing liquid water stands in a sealed room measuring 5.0m wide x 4.0m long x 3m high. The temperature of the room is 320K and, over time, some of the liquid water evaporates. Eventually, the liquid water level in the vessel stops changing. a) How many grams of water will be in the humid air within the sealed room? b)A contact lens cleaning system on the market uses an aqueous hydrogen peroxide solution to disinfect the contact lenses. In a few hours, the hydrogen peroxide decomposes to liquid water and oxygen gas in a catalyzed reaction. The vessel in which the reaction occurs has a hole in the top. Use chemical potential to explain how the equilibrium concentration of hydrogen peroxide would be affected if the hole was not present.
- Starting with the expression for thermal expansivity show that for an ideal gas: ? = ?/T and Give two interpretations of this final expression ? = 1/T please give clear handwritten answer ASAP!1 mole of a hydrocarbón fuel and 2 moles of air (both at same initial temperature To=25°C) represent diffusion flame, if the ratio of the summation of passive scalar in initial fuel side to oxygen side is 100. Take the specific heat at constant pressure for all species are constant (Cp), then the heat of combustion is ....b. Steam at 170 bar has a specific volume of 0.01796 m/kg, determine the temperature, the specific enthalpy and the specific internal energy.
- The molar enthalpy of vaporization of a liquid at its normal boiling point is 39.16 kJ mol-1. When a liquid boils some part of the enthalpy is used in converting the liquid into vapor. The remaining is used in expansion work of the vapor against the external pressure. Calculate what percentage of the enthalpy of vaporization of this liquid is used for the expansion work. Assume that the vapor behaves ideally and that the molar volume of the liquid can be neglected when compared to the molar volume of the vapor. At the normal boiling point of liquid 466.6K, the pressure is 1.00 atm (exactly) by definition.The molar heat capacities for solid, liquid, and gaseous molecular Cl₂ can be written in the following general form, where the coefficients a, b, c and d are given in the table below. Phase solid liquid gas T Range (in K) 15-172.12 172.12-239.0 > 239.0 Note: Cpº R = a +bT+cT² +dT³ a -1.545 7.689 3.812 b (in K-¹) 0.1502 0.005582 0.001220 c (in K-²) -0.001179 -1.954 x 10-5 - 4.856 x 10-7 d (in K-³) 3.441 x 10-6 Tfus = 172.12 K AfusH = 6.406 kJ/mol Tvap = 239.0 K AvapH = 20.40 kJ/mol (a) Use this data to find the entropy content (in J/K) for molecular chlorine at 200 K, if the absolute entropy at 15 K is 1.401 J/K. (b) What is the change in enthalpy, AH (in kJ), if one mole of Cl₂ is heated from 200 to 250 K?(2) The thermal expansion coefficient is given by: 1(av a =- (a) Would you expect the thermal expansion coefficient to appear to be first order or second order for a phase transition? Explain your answer. (b) Sketch the thermal expansion coefficient vs temperature for a phase transition.
- Obtain compression expansion work for van der Waals gas when the process is performed at a constant temperature.Determine the theoretical flame temperature that can beobtained by the combustion of methane with 25% excess air.Air and methane enter at 298K and a pressure of 1 atm. Thereaction is complete. Standard heat of formation at 298 inkJ/kmol are: Methane (g) = -74520, CO2 (g) = -393500, Watervapor (g) = - 241813.1. Initial temperature of solid specimen = 98 Initial temperature of vessel, stirrer and water = 29 Equilibrium temperature of the mixture = 34 the change in temperature of water and solid specimens are and. 4:40 DM