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When a 5.60 g sample of solid sodium hydroxide dissolves in 100.0 g of water in a coffee-cup calorimeter, the temperature rises from 22.3 degrees Celsius to 41.6 degrees Celcius. Calculate delta H in kJ/mol for the solution process if the specific heat capacity of the solution is 4.18 J/g*K.
NaOH(s)=Na+(aq)+OH-(aq)
The electron in a hydrogen atom occupies a 6p orbital. What is the longest wavelength of light that can be emitted by this atom? Give answer in nanometres, nm
Who does the first ionizaiton energy of the alkali metal in a given period compare with the first ionization energy of the halogen in the same period. What is the result in terms of how these elements tend to react with each other
How do you calculate the force of water hitting a concrete cylindrical pole. The velocity of the water is 2 ft/s, the depth of the water is 10 ft, and diameter of the pole is 3 ft. So what would be the total force exerted on the pole by the water?
How many liters of the antifreeze ethylene glycol [CH2(OH)CH2(OH)] would you add to a car radiator containing 6.50 L of water if the coldest winter temperature in your area is -20°C?
You are given an unknown sample that when treated with hydrochloric acid forms a precipitate. After decantation, you add boiling water to the solid. All of the solid disappears.
a monolayer of N2 molecules (effective area 0.165 nm2) is adsorbed on the surface of 1.00 gm of Fe/Al2O3 catalyst at 77K,the boiling point of liquid nitrogen. Upon warming the nitrogen occupies 2.86 cm3 at 0 degree celsius and 760 torr. What is th..
the density of plutonium metal is 19.84 g/cm3 , and the density of plutonium (IV) oxide is 11.46 g/cm3. over a period of 7-10 years, a 2.5-kg sample of plutonium metal stored at Los Alamos National Laboratory in New Mexico was converted to plutoni..
What is molality of a 1.22 M solution of sugar (C12H22O11)? The density of the solution is 1.12 grams/ml 2- Which of the following in each pair with be more soluble in water?
If the acid dissociation constant, Ksuba, for an acid HA is 8 x 10^-4 at 25 degree C, what percent of the acid is dissociated in a 0.50 M solution of HA at 25 degree C?
A solution is prepared by mixing 500. mL of 0.10 M NaOCl and 500. mL of 0.20 M HOCl. What is the pH of this solution? [Ka(HOCl) = 3.2 ? 10-8]
A sample of a gas in a piston/cyclinder apparatus occupies 30.2 mL at 1.08 atm and 22.2°C. If the volume of the sample is increased to 67.3 mL and the temperature changes to 30.9°C, what is the new pressure, in atm, of the sample
A sample of the unknown complex is analyzed and has an absorbance of 0.528. What is the molar concentration of Cu^2+ ions in the unknown solution?
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