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The Gibb's energy change occurring during the irreversible process is :
(A) negative
(B) positive
(C) dependent on whether the process is exothermic or endothermic
(D) negative only if the process is exothermic
A rectangular beam made using concrete with f'c = 6000 psi and steel with fy=60000 psi has a width b= 20 in. The concrete modulus of rupture fr=530 psi. The elastic moduli of the concrete and steel are, respectively,
calculate the value for E for the cell at 25oC (b) A current is drawn from the cell until 1.20 g of silver have been deposited at the silver electrode. Calculate the value of E for the cell at that stage of operation.
the maximum number of electrons in an atom that can have quantum numbers n2 and l1 is a. 2 b. 4 c. 6 d. 8 2 which
Consider a glass of 298 mL of water at 30°C. Calculate the mass of ice at -15°C that must be added to cool the water to 10°C after thermal equilibrium is achieved.
An inclined manometer is being designed to measure pressure using mercury and water. Pressure differences as small as 100 Pa (0.001 atm) must be measured, but it is desired to have a minimum reading of 1.0 cm. At what angle from horizontal must th..
If it takes 8.5 for the concentration of to decrease from 0.90 to 0.45 , how many hours are required for the concentration to decrease from 0.40 to 0.10
A certain sample of the mineral galena weighs 12.4 and has a volume of 1.64 mL. What is the density of galena?
The enthalpy of combustion for propane is -2044 kJ/mol. How many liters of propane (at STP) must be burned in order to convert 400 grams of ice initially at -9°C to liquid water at 84°C
for each of the following three questions 25.0 ml of 0.100 mpyridine kb 1.70 x 10-9 istitrated with 0.100 m hcl. for
(a) Calculate the minimum voltage required to produce 1 mole of aluminum at this temperature. (b) If the actual voltage applied is exactly two times the ideal value, calculate the energy required to produce 2.33 kg of the metal.
zinc metal reacts with yellow crystals of sulfur in a fiery reaction to produce a white powder of zinc sulfide. a
Calculation of Hydrogen Ion Concentration from pH What is the H concentration of a solution with pH of
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