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Question- You are asked to prepare a pH=4.00 buffer solution starting from 1.25L of 2.00M solution of HF. how many grams of NaF should be added to prepare the buffered solution? Ka=6.8 x 10^-4
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Utilizing bond energies, compute the enthalpy change for the burning of one mol of acetylene gas with excess oxygen gas yielding carbon dioxide gas as well as gaseous water (steam)
The volume of the CO2 gas was compute at 1 atmosphere pressure and 0 degrees Celsius (273 degrees K) to be a total of 896 mL of gas. Evaluate the percentage of barium carbonate in the mineral sample.
Charcoal found under a stone at Stonehenge, England, has a carbon-14 activity that is 0.50 that of new wood. How old is the charcoal? (The half life of carbon-14 is 5,730 years.)
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If 1.020g of KHC8H4O4 (204.23g/mol) is completely neutralized with 0.200 M KOH, what volume of potassium hydroxide is required. KHC8H4O4(aq) + KOH(aq) -(arrow to the right) K2C8H4O4(aq) + 2 H2O(1)
Calculate the molar concentration of HCl in a solution that has a specific gravity 1.185 and is 36.5% (w/w). Prepare from this bottle 1 L of 0.1 HCl solution. 25 mL of this solution titrated with 30 mL of NaOH.
How does the Hammond postulate explain: a. the greater selectivity for bromination vs. chlorination of an alkane? b. the fact that the relative reactivity of C-H bonds of an alkane for free radical chain halogenation is 1º>2º>3º
If a gaseous sample contains 56% N2 by volume, explain what is the solubility of N2 in water at 25°C and 1.0atm (kH in H2O at 25°C = 7 multiplied by 10-4 mol/L•atm)
Determine the fraction of the energy radiated by the sun in the visible region of the spectrum (350 nm to 700 nm). (Assume the sun's surface temperature is 5800 K.)
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