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An 11.0 gram sample of CaCl2(s) is dissolved in 125 grams of water with both substances at 25.0°C. If the final temperature of the mixture is 39.2 °C, what is the enthalpy of the dissolutio
What molar ratio of sodium acetate to acetic acid should be used to prepare a buffer with pH = 4.5? Ka acetic acid = 1.8 x 10-5.
You have a stock 0.100 M solution of KMnO4 and a series of 100-mL volumetric flasks. What volumes of the stock solution will you have to pipet into the flasks to prepare standards of 1.00, 2.00, 5.0
Although a protein's primary sequence can be inferred from the nucleotide sequence, what are some examples of the modifications that can only be determined by direct protein sequencing?
the difference in the mass of 100 moles each of sodium atoms and sodiu ions is 5.48002g. compute the mass of an electron.
How much heat does your body lose when 2.50 of sweat evaporates from your skin at 25 ? (Assume that the sweat is only water.) The heat of vaporization of water at 25 is 44.0 .
How much energy is required to boil 45.5g of water at 100 degrees C at sea level? The molar heat of vaporization of water is 40.6 kJ/mol
Compounds X and Y have the formula C6H12. Both X and Y react with one molar equivalent of hydrogen in the presence of a palladium catalyst to form 2-methylpentane.& ; The heat of hydrogenation of X
The hydrolysis(addition of water) of an ester is called saponification and is a reversible reaction. What kind of experimental conditions do you think you would need in order to carry out the revers
A toothpaste contains 0.240% by mass sodium fluoride used to prevent dental caries and 0.30% by mass triclosan, an antigingivitis agent.
Suppose that a fully charged lead-acid battery contains 1.50L of 5.00M H2SO4. What will be the concentration of H2SO4 in the battery after 3.40A of current is drawn from the battery for 4.50 hours?
The solubility of compound A in ethanol is 0.80g per 100.0mL at 0oC and 5.00g per 100.0mL at 78oC. What is the minimum amount of ethanol needed to recrystallize a 12.00g sample of compound A?
Determine the amount (in grams) of boron that when substitutionally incorporated into 1 kg of silicon will establish a charge carrier density of 3.091×1017 carriers/cm3.
A 25.0 mL sample of a solution of the weak base aniline, C6H5NH2, requires 25.67 mL of 0.175 M HCl to reach the equivalence point. (Kb for aniline = 4.0 x 10-10)
Based on this information, the calculations correctly calculate what quantity, % fat or % fat-free meat? Is the incorrectly calculated quantity over or under estimated?
Calculate the mass of silver chloride required to plate 245 mg of pure silver. Silver chloride, often used in silver plating, contains 75.27% Ag
Potassium nitrate decomposes on heating, producing potassium oxide and gaseous nitrogen and oxygen: To produce 56.6 kg of oxygen, how many (a) moles of KNO3 and (b) grams of KNO3 must be heated?
How many moles of carbon dioxide would have to be added at constant temperature and volume to increase the amount of carbon monoxide to 0.300 moles?
Estimate the value of the equilibrium constant at 685 K for each of the following reactions. Delta H and S for BrCl(g) is 14.6 kJ/mol and 240.0 J/ mol * K, respectively. 2 NO_2(g) > N_2O_4(g
When separated from a water solution, CuSO 4 forms a hydrate with 5 water molecules per formula unit. If 40 g of an- hydrous CuSO 4 are dissolved in water, what mass of the hydrate could be recovere
Suppose that you developed your own new temperature scale, denoted oN. What would be the temperature at which phosphorus melts (44oC) on your new temperature scale?
Calculate the enthalpy of the reaction: 2NO(g) + O2(g) --> 2NO2(g) given the following reactions and enthalpies of formation:
Hypofluorous acid, HOF, is very unstable, decomposing in a first-order reaction to give HF and O2, with a half-life of 30. minutes at room temperature: HOF(g) ! HF(g) + 1⁄2 O2(g) If the partia
Water has vapor pressure of 23.8 torr at 25 degrees celsius. Find vapor pressure of water at 40 degrees celsius if delta H of vaporization is 40.7 KJ/mol.
In the Grignard synthesis of Benzoic Acid, what is the weight of frost (ice) on the dry ice that will react with all of the phenyl Grignard reagent resulting in the production of no benzoic acid?