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The standard enthalpies of formation of ions in aqueous solutions are acquired by arbitrarily assigning a value of zero to H+ ions that is, Hf [H+ (aq)] = 0. For the subsequent reaction- HCl (g) --H20---> H+ (aq) + Cl- (aq) Hf = -74.9 kJ/mol
Calculate the change in enthalpy of this reaction. Specific heat of the solution = 4.184 J/(g oC) State your answer in kJ with 3 significant figures. Don't forget to enter the unit behind the numerical answer. The molecular weight of KOH is 56.2 g..
caffeine is about 10 times as soluble in hot water as in cold water a chemist puts hot water extract of caffeine in to
the vapor pressure of chlorine dioxide clo2 is 155 torr at -22.75 ?c and 485 torr at 0 ? c. what is the normal boiling
Calculate the pH of 0.500L of a buffer solution composed of 0.20 M butyric acid (CH3(CH2)2)2COOH, Ka = 0.000015) and 0.10 M sodium butyrate, (NaCH3(CH2)2COO).
A 4.40 g nugget of pure gold absorbed 295 J of heat. The initial temperature was 21.0°C. What was the final temperature?
Calculate the work (in kJ) when 3.00 moles of hydrogen gas are produced from the reaction of sodium in excess water at 298 K:
The sugar in deoxyribonucleic acid, DNA, is called 2-deoxy-D-ribose. This sugar has two stereocenters. 2-Deoxy-D-ribose has how many diastereomers
The reaction of 2, 2-dimethyl-1-propanol with HBr is very slow as well as gives 2-bromo-2-methyl-butane as the major product. Give a mechanistic explanation for these observations.
How many grams of Br2 would there be in 8.00 moles of Br2?
The action of bacteria on meat and fish produces a poisonous compound called cadaverine. As its name and origin imply, it stinks!
Calculate the pH of the solution obtained by dissolving 0.2 moles of glycine and 0.1 mole NaOH in a liter of water.
Suppose a rotation for S-(+)-ethyl 3-hydroxybutanoate of 37.2? is reported to correspond to an enatiomeric excess of 85%.
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