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Part 1
Calculate the acidity constant of benzoic acid in water at 298K if Delta Gf for C6H5CO2-(aq) is -269.2 kj/mol and delta Gf for C6H5COOH(aq) is -293.1 kj/mol. (The Delta Gf has a degree symbol on it if that is needed.)
Part 2
What mass of sodium benzoate must be added to 3 L of 1.1 M C6H5COOH(aq) to make a buffer with pH=3? Answer in units of g.
Provide your answer in scientific notation
A perfume company wants to dispense 53.7 gallons of a new fragrance into small vials. How many 25.0 ml vials can they fill(rounded to the nearest full vial)
How many milliliters of a 0.28 M HCl solution are needed to react completely with 8.4 g of zinc to form zinc(II) chloride? Answer in units of mL.
what was your sampling rate to the nearest 1 ml/min over a four hour sample period if you collected 35 mg of carbon tetrachloride from a known concentration of 150 PPM?
Which compound has the higher barrier to rotation about the central C-C bond: 2,3-dimethylbutane or 2,2,3-trimethylbutane. Or is the barrier to rotation for each the same? Please draw out and explain reasoning, use extra paper if necessary.
2NOCl(g) → 2NO(g) + Cl2(g) ,At 450 K the rate constant is 15.4 atm-1s-1. How much time (in s) is needed for NOCl originally at a partial pressure of 46 torr to decay to 25.8 torr.
How many grams of dry NH4Cl need to be added to 2.50 L of a 0.100M solution of ammonia, NH3, to prepare a buffer solution that ahs a pH of 8.80?
talc is a mineral that has low conductivity for heat and electricity and that is not attacked by acid. it is used as
When aluminum is placed in concentrated hydrochloric acid, hydrogen gas is produced. 2Al(s)+6HCl(aq) yeilds 2AlCl3(aq)+3H2(g). what mass of Al(s) if required to produce 725.5 mL of H2(g) at STP
write ground-state electron configurations for these ions, which play important roles in biochemical processes in our bodies. (Use a noble gas core abbreviation)
A hot tub is filled with 470 gallons of water, which has a density of 1.0. How many kilocalories are needed to heat the water from 67 to 109?
How many isomers are there for the trifluorotrinitrocobalt (III) complex? Draw them. Are any enantiomers. Label each structure with an appropriate descriptor
C3H8(g) + 5 O2(g) ? 3 CO2(g) + 4 H2O(g) Calculate the overall enthalpy change for this reaction using standard bond enthalpies.
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