3.31 Calculate the theoretical flame temperature of a gas mixture consisting of 20% CO and 80% N2 when burned with 100% excess air, both air and gas initially being at 298 K. The standard heat of reaction at 298 K is –283.178 J/mol CO. The heat capacity in J/mol K are given by Cp= a + bT+gT², where a b CO2 26.54 42.45 O 10-3 - 14.298 O 10–6 02 25.61 13.26 O 10-3 5.815 O 10-3 - 4.208 O 10–6 - 0.289 O 10-6 N2 27.03

4.) Steam undergoes an Isentropic process where it is initially at 1.30 MPa and 200 C then it expands to a pressure of 0.75 MPa, thus becoming wet steam. What is the dryness of the steam and the change in enthalpy for the process? • 100%, -2766.4 kJ/kg • 98.75, -68.94 kJ/kg • 200%, -2809.7 kJ/kg • 96.95%, -105.94 kJ/kg

A Stirling cycle is a thermodynamic cycle similar to the Carnot cycle and is defined by the following processes. -> 2: Isothermal expansion -> 3: isochoric cooling -> 4: isothermal heating -> 1: isochoric heating Draw a PV diagram for a Stirling cycle in which 50g of Ar (treated as an ideal gas) is isothermally expanded from 4L to 16L at a temperature of 700K. The sample is then undergoes isochoric cooling to 298K.  The sample is then isothermally compressed to 3L and finally undergoes isochoric heating back to 700K.  Label the states 1 – 4 on the graph.

The lower heating value for gaseous n-octane is 44,791 kJ/kg, and its latent heat of vaporization is 300 kJ/kg. Using this information, determine the enthalpy of formation at 298 K for liquid n-octane in kJ/kmol. (Here you are to compute the enthalpy of formation from the given information, not look it up in a property table.)

Pure CO is mixed with 100 percent excess air and completely burned at constant pressure. The reactants are originally at 400 K. Determine the heat added or removed if the products leave at 600 K. The standard heat of reaction at 298 K is -282.99 kJ per mol CO burned. The mean specific heats applicable in the temperature range of this problem are 29.10, 29.70, 29.10, and 41.45 J/mol K respectively for CO, O₂, N₂ and CO₂.

Once the methanol has reached its boiling point, it must be vaporized. Themolar enthalpy of vaporization for methanol is 38 kJ mol-1 . How much heat must be added to vaporize 1.00 kg methanol?

AF A single-effect evaporator operated at 100 kPa is used to concentrate 5 wt.% NaOH solution at 110°C and 200 kPa to 8 wt.%. The evaporator is heated by a saturated steam at 120 °C where the heat transfer area is 50 m². The overall heat transfer coefficient is 2000 J/m².s.K. The molar mass of NaOH is 40 kg/kg mol. a) what is the feed flow rate, the product flow rate and the generated vapor flow rate? b) what is the steam needed for this operation? c) what is the steam economy for this evaporator?

The heat of fusion of water is 6.01 kJ/mol. The heat capacity of liquid water is 75.3 J/mol- K. The conversion of 20.0 g of ice at 0.0 °C to liquid water at 30.0°C requires kJ of heat. O 17.2 O 16.7 O 9.19 O Insufficient data are given. O 18.8

05: Acetylene gas (C₂H₂) at 25 °C is burned during a steady-flow combustion process with 30 percent excess air at 27 °C. It is observed that 75x10³ kJ of heat is being lost from the combustion chamber to the surroundings per kmol of acetylene. Assuming combustion is complete, determine the exit temperature of the product gases.

A food product containing 80% moisture content is being frozen. Estimate the specific heat of the product at -8 ° C when 82% of the water is frozen. The specific heat of the dry product is 2.5 kJ / (kg ° C). it is assumed that the specific heat of water at -10 ° C is the same as the specific heat of water at 0 ° C, and the specific heat of ice follows the function Cp es = 0.0062 Tbeku + 2.0649. Cp frozen product = AnswerkJ / kg ° C.