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In a quench hardening process, steel rods (ρ = 7830 kg/m3, cp = 444 J/kg.K and k = 70 W/m.K) are heated in a furnace to 900oC and then cooled in a water bath to an average temperature of 90oC. The water bath has a uniform temperature of 35oC and convection heat transfer coefficient of 400 W/m2.K. If the steel rods have a diameter of 60 mm and a length of 2.5 m, determine
a) The time required to cool a steel rod from 900oC to 90oC in the water bath
b) The total amount of heat transferred to water during the quenching of a single rod
Starting with 86.3 g NO and 25.6 g H2, find the theoretical yield of ammonia in grams
what is the energy of an X ray with a wavelength of 3.52×10-9m and a microwave with a wavelenght of 6.63×10-2m?
an undergraduate researcher in a biology lab produced a buffer solution by dissolving sodium dihydrogen phosphate (Ka = 6.2 × 10-8) and sodium hydrogen phosphate (Ka = 3.6 × 10-13) together in an aqueous solution. What mole ratio of Na2HPO4/NaH2PO..
It is often necessary to do calculations using scientific notation when working chemistry problems. For practice, perform each of the following calculations
How many moles of CO(NH2)2 are present in 145 g of water, if the freezing point of the solu- tion is -4.02?C? kf (water) = 1.86 K · kg/mol.
A sample of laughing gas occupies 500.0Ml at a standard temperature and pressure . what volume will the gas occupy at 95.0oC and 525 torr.
Hydrogen bonding is the intermolecular attractive forces between two hydrogen atoms in solution. The hydrogen bonding capabilities of water molecules cause CH3CH2CH2CH3 to be more soluble in water than CH3OH.
A saturated solution of MgF2 has [Mg^2+] = 2.6 X 10 ^-4 M and [F-] = 5.2 X 10 ^-4 M. What is the value of Ksp for MgF2
the permangenate ion and determine the standard reduction potential for the reaction.
What product or products would you expect to obtain by the addition of bromine to cis-cinnamic acid, assuming that it reacts by the same mechanism as the trans acid
A 550 mL volume of hydrogen chloride gas, HCl, is collcted at 27 degrees C and 790 mm Hg. What volume will it occupy at STP?
If an analytical method has been developed and the retention time for a particular anabolic steroid has been determined, how might you use this method to determine the possibility of the use of anabolic steroids by an athlete.
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