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What is the final temperature when 20.0 g of water (specific heat capacity 4.184 J•g-1•K-1) at 80.0 ?C is mixed with 30.0 g of water at 20.0 ?C in an insulated container?
The heat of formation of Al2O3(s) is change Hf= -1669kJ/ /mol. a.) Calculate the heat evolved when 3.47 g of Al burns in oxygen. b.) Find the mass in grams of Al that burns when 1039 kJ are evolved.
How many seconds are required to produce 4.94 mg of chromium metal from an acidic solution of potassium dichromate, using a current of 0.234 A?
The nitrite ion (NO2-) is commonly determined by a colormetric procedure using a reaction called the Griess reaction. Im this reaction the sample containing nitrate is reacted with sulfanilimide
a solution contains a mixture of pentane and hexane at room temperature. the solution has a vapor pressure of 268 rm
What is the concentration of the ammonium ion (in M) in a solution which contains 51 g ammonium sulfide in 635 mL of solution
Tallow is stored in a vertical tank 3 m in diameter and 9?m high. The tank is insulated with a 0.05?m layer of 85% magnesia. To prevent freezing, the tallow is maintained at a temperature of 50oC by condensing steam at 135.8 kPa (abs) in a heating..
For a certain experiment, R-140a vapor is contained in a sealed glass tube at 20 degrees celcius. We want to know the pressure at this condition, but there is no means of measuring it since the tube is sealed
which molecules have nonpolar intermolecular forces a). ClO2- b). NaF c). CF4 d). O3 e). NO
Which of the following when added to a 1.0 L solution containing 0.10 M NaF and 0.20 M HF will result in a solution where pH = pKa for HF. Ka for HF = 7.2 x 104
suppose a black-body chamber is constructed from 55.8 g one mole of iron and heated to 500 k.classical theory and the
What is the purpose of grinding the magnesium before introducing it into the reaction flask?
Determine the number of sulfate ions in 2L of a 0.5M CaSO4 aqueous solution. Then, determine the number of calcium ions dissolved in the same aqueous solution.
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