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What is the molarity of a solution made by dissolving 3.5 g of Ba(OH)2 in enough water to make 440 mL of solution?
What weight of A would be removed from a solution of 10g of A in 100mL of water by a single extraction with 100 mL of hexanes? What weight of A would be removed by four successive extraction with 25-mL portions of hexanes?
which is the lowest at 25 C a) deltaG f for H2O(s) b) deltaG f for H2O(l) c) deltaG f for H2O(g) d) 1/2 deltaG f for O2(g) plus deltaG f for H2O(g)
The following reaction takes place when some drain cleaners are added to water. What mass of hydrogen gas will be produce from 4.76 g of aluminum and 3.23 g of NaOH- 2Al(s) + 2NaOH(s) + 6H2O(l) -> 2NaAl(OH)(aq) + 3H2(g)
analyze run-off water for the presence of a.heavy metals b. benzene-toluene-xylenes and c. polynuclear aromatic
an aqueous solution of an unknown solute is tested with litmus paper and found to be acidic. the solution is weakly
The enthalpy change for melting ice at 0°C and constant atmospheric pressure is 6.01 kJ/mol. Calculate the quantity of energy required to melt a moderately large iceberg with a mass of 1.39 million metric tons. (A metric ton is 1000 kg.)
Question- Use the Henderson-Hasselbalch equation to calculate the pH of a buffer solution that is 0.28M in formic acid (HCO2H) and 0.52M in sodium formate (HCO2Na).
Use the Nernst Equation to calculate Ecell at 25 C for electrolysis of aqueous sodium chloride if the concentration of chlorine in the brine solution is 4.5 M and the partial pressure of Cl2 is 0.001 atmospheres.
A gas is confined to a cylinder under constant atmospheric pressure. When 414 of heat is added to the gas, it expands and does 106 of work on the surroundings.
Determine the uncertainty in position in nm associated with an electron that is moving with a velocity of 417 km/s. The uncertainty in the velocity is 5.00%. The electron rest mass is 9.11 x 10-31 kg. Use delta x * delta v >= h/4 pi m
When 2.0 x 10^2 mole of nicotinic acid (a monoprotic acid is dissolved in 350 mL of water, the pH is 3.05. What is the Ka of nicotinic acid
For each of the following electronic transitions in the hydrogen atom, calculate the energy, frequency, and wavelength of the associated radiation, and determine whether the radiation is emitted or absorbed during the transition:
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