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The concentration of manganese in steel can be determined spectrophotometrically by dissolving the steel in acid and oxidizing Mn to MnO4?. The resulting solution is purple and the absorbance at 525 nm can be monitored. A standard solution containing 0.228 mM of Mn has an absorbance of 0.343 in a 1.00 cm cell. The absorbance of an unknown solution of Mn is 0.404. What is the molar concentration of Mn in the unknown solution
The molar enthalpy of vaporization of boron tribromide is 30.5 kJ/mol, and it's normal boiling point is 91degrees C. What is the vapor pressure of BBr3 at 34 degrees C.
Draw an energy diagram for the enthalpy of solution of NaCl given that the lattice energy is 773 kJ/mol, the enthalpy of hydration is -769 kJ/mol with an enthalpy of solution equal to 4 kJ/mol.
Find the energy of a photon of light if the wavelength of the light wave is 6.88 x 10-7 m.
A 47.5 g sample of metal was heated to 100 degrees C and then poured into 100 g of water at 24.0 degrees C. The temperature of the resulting mixture was 28.0 degrees C.
Predict what volume (mL) of 0.3000 M NaOH is required to titrate 25 mL of 0.3000 M HCl to the equivalence point
Calculate the final temperature of the mixture, assuming no heat is lost. The heat capacities of Hg and H2O are 27.98 and 75.33 J/mol/K, respectively.
A multiple stage evaporate process concentrates a weak solution of LiOH from 4.48 wt% to 26.78wt%. This evaporator processes 10 metric tonnes of solution each day.
A solution is prepared by dissolving 297 g of sucrose (C12H22O11) in 624 g of water. What is the vapor pressure of this solution at 30°C? (The vapor pressure of water is 31.8 mmHg at 30°C.)
Benzoic acid is used to titrate an unknown base, and the pH of solution is recorded during the titration. Halfway to the ultimate endpoint of the titration, the pH of solution was recorded at 7.64. What is the value of Kb for the unknown base?
Calculate the amount of heat required to heat a 3.6 kg gold bar from 25 C to 64 C. Specific heat capacity of gold is 0.128 j/g C.
A water sample was found to contain [Ca2+]=35 mg/L and [Mg2+]=20 mg/L. Determine the water hardness in terms of mg/L CaCO3.and state whether it has low, medium or high hardness.
The equilibrium constant, Kc, for the following reaction is 1.29E-2 at 600 K: COCl2(g) CO(g) + Cl2(g)
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