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Four hundred kg/h of Steam from a low pressure turbine at 12.5 atm. and 250 C goes into a feed water heater which preheats the water entering the economizer in a boiler. The steam is comes out of the feed water at 200 C. The water at a flow rate of 500 kg/h enters the feed water heater at 20C. Calculate the feed water exit temperature.
what are the relative energies of the orbitals defined by n=4? if this atom is placed in a magnetic field, how would the relative energies of these orbitals change and why
How many molecules of substance B are produced when 30.0 g of substance A reacts? The molar mass of substance A is 23.5 g/mol. A) Convert the mass of A to moles
what wavelength of light in nm is absorbed by a ground state hydrogen atom could cause an electron to transition to n=3
a solution of ethanol c2h5oh in water is prepared by dissolving 63.5 ml of ethanol density 0.79 gcm3 in enough water
Which value is colosest to the POH of a 0.3 M solution of the weak base methylamine (CH3NH2)? the Ka for the acid form of methylamine is 2.27e-11 answer choices are 0.011, 1.94,3.92,10.08 and 12.06.
How many grams of sucrose must be added to 320g of water to lower the vapor pressure by 1.5mm Hg at 25 degrees Celcius? The vaporpressure of water at 25 degrees Celcius is 23.8mmHg
hat mass of KOH, in grams, is required to prepare 125 mL of 2.35 M KOH solution? How many grams of NaOH will react completely with 187 ml of 0.430m HCl?
What is the pH when 50.0 mL of 0.100 M NaOH have been added. 4. What is the pH when 100.0 mL of 0.100 M NaOH have been added.
Draw lewis Dot structures. Use model kits, styrofoam balls and/or gum drops to make a model of the molecule or ion. Be sure to place electron groups (toothpicks or sticks) as far apart as possible.
The entropy increase after mixing 2 moles of oxygen 1 mole of nitrogen, which were prepared at the same pressure and temperature, is (in J/K). (Pretend oxygen and nitrogen are ideal gases)
Find concentration of each ion present in the solution formed by mixing: 44.0 mL of 0.150M Na2SO4 and 25.0 mL of 0.200M KCl.
What is the pH of a buffer that consists of 0.20 M NaH2PO4 and 0.40 M Na2HPO4? Ka = 6.2 × 10-8
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