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The heat required to raise the temperature of a large cup of water (for coffee) from room temperature to boiling is approximately 100 kJ. Express this quantity of heat in kilocalories and British thermal units. Show your calculations.
Consider the combustion reaction between 30.0mL of liquid methanol ( density = 0.850 g/mL) and 15.0L of oxygen gas measured at STP. The products of the reaction are CO2 and H2O
A compound A (C22H27NO) is insoluble in acid and base but reacts with concentrated aqueous HCl and heat to give a clear aqueous solution from which, on cooling, benzoic acid precipitates.
Potassium hydroxide is used to precipitate each of the cations from their respective solution. Determine the minimum concentration of {\rm KOH} required for precipitation to begin in each case.
find the empirical formula for the following compounds given the following information.find the empirical formula for
57.0 mL of 3.50 M sodium hydroxide is combined with 35.0 mL of 1.80 M magnesium chloride. What mass in grams of solid forms?
Which type of mutation is expressed when a DNA sequence changes from GGA TCA CCG GAA
A sample of an unknown peptide undergoes a single round of Edman degradation, which liberates ATZ-Gly. Another sample of the peptide is treated with trypsin, and a third sample is treated with chymotrypsin. The table below shows the fragments.
What would happen to the A450 valure for a sample as test tube#10(is included 1ml of 0.0025M Fe(NO3)3 , 1ml of 0.0025M KSCN, and 5ml of 0.1M HNO3 ) ,if accidentally added 5 drops of disodium hydrogen phospate
The human body obtains 1078 kJ from a candy bar. If this energy were used to vaporize water at 100°C, how much water in liters could be vaporized?
The amino acid histidine has three pKa's at 1.8, 6.0 and 9.3. In a 0.01 M solution of histidine, what is the concentration of protonated carboxylic acid at pH 7.4? The primary amine? The side chain?
The solubility of barium carbonate,BaCO3, is .0100 g/L . Its molar mass is 197.6 . What is the Ksp of barium carbonate?
use this data for the questions...-mass of tube mno2 21.5403g-mass of tube mno2 kclo3 kcl 22.5518g-constant mass
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