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If the dose of Na2CO3 is 100 mg/L , the volume of EDTA is 9.5 mL and the total hardness is 95 mg/L as CaCO3 calculate the % total hardness removed.
Calculate the size of the quantum involved in the excitation of (a) an electronic oscillation of period 1.0 fs, (b) a molecular vibration of period 10 fs, (c) a pendulum of period 1.0s Express the results in joules and kilojoules per mole.
A sample of ammonia gas was allowed to come to equilibrium at 400 K.2NH3(g) ↔ N2(g) + 3H2(g) At equilibrium, it was found that the concentration of H2 was 0.0584 M, the concentration of N2 was 0.0195 M, and the concentration of NH3 was 0.430 M.
In extracting an organic compound from an aqueous solutin, what is the practical advantage to having the organic solvent be more dense
An unknown gas composed of homonuclear diatomic molecules (its structure is X2) diffuses at a rate that is 1.07 times that of O2 at the same temperature. What is the identity of the unknown gas
If 29.58 mL of 0.550 M NaOH is required to titrate the oxalic acid in the 0.554g sample to the equivalence point, what is the weight percent of oxalic acid in the mixture. Oxalic acid and NaOH react according to the equation H2C2O4 (aq) + 2 NaOH(a..
If 72.4 kJ of heat is supplied to a 852 g block of metal, the temperature of the metal increases by 9.6°C. Calculate the specific heat capacity of the metal in J/g·°C.
solution is diluted to a total volume of 278 mL. A 139-mL portion of that solution is diluted by adding 155 mL of water. What is the final concentration?
If a solution of sodium chloride contains 5.2 NaCl in 900 grams of water. What is the concentration of the solution in parts per million?
heat from a mountain climber's stove at an elevation where the boiling point of water is 89 degrees celsius, how many kJ are required to boil the water?
Given a stock solution of a food dye having a concentration of 1.0 x 10-5 and an absorbance of 0.700. If a new solution is made by diluting exactly 10.0 mL of the solution with exactly 44.4 mL of distilled water, what should the absorbance of the ..
One of the reasons that back titration is preferred to direct titration is because of the limited solubility of carbonates in water. Why does this make direct titration difficult and why does back titration tend ot circumvent this difficulty
How many moles of Mg3N2 would be produced when 180.0 g of Mg reacts with 85.0 g of N2.
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