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10 mL aliquots of natural water were pipetted into 50 mL flasks. Exactly 0.0, 0.5. 10.0, 15.0, and 20.0 mL of a standard solution containing 11.1 ppm of Fe were added to each, followed by an excess of thiocyanate ion to give the red complex Fe(SCN). After dilution to volume, the instrumental signal S for each of the five solutions, measured with colorimeter, was found to be: 0.240, 0.437, 0.621, 0.809, and 1.009, respectively. What was the concentration of Fe in the water sample?
Given the following equation. What is the maximum mass of FeO3 that can be prepared when 360.0g of FeS2 are mixed with 47.5g of oxygen gas? A balanced equation is this: 4 FeS2 (s) + 11 O2 (g) ----> 2 Fe2O3 (s) + 8 SO2 (g)
Predict the anode, cathode, and overall cell reactions when an aqueous solution of each of the following salts is electrolyzed in a cell having
The density of iron is 7.87 . What is the mass of a 4.00 4.00 1.00 block of iron? Express your answer to three significant figures and include the appropriate units.
What are the possible values of n and ml (the principal and angular momentum quantum numbers) for an electron in a 5d orbital
Iodine-131 is used to treat thyroid cancer. It decays by betaemission and has a half-life of 8.1 days. Write a balanced nuclear reaction for the decay of iodine-131.
What is the relationship between the atomic numbers and the ionic radius of the elements in a group.
An unknown sample (0.6855 g) containing KHP is titrated to the equivalence point with 9.75 mL of ).07892 M NaOH, How many moles of KHP present?
MgO has the same crystal structure as NaCl, face-centered cubic. How many oxide ions surround each Mg^2+ ion as nearest neighbors
What volume (mL) of 0.135 M NaOH is required to neutralize 13.7 mL of 0.129 M HCl? a: 0.24 b: 13.1 c: 0.076 d: 6.55 e: 14.3
How much heat (in kilojoules) is evolved or absorbed in the reaction of 2.45 of with enough carbon monoxide to produce iron metal?
Calculate the pH of a buffer that contains 0.060M ammonium chloride
For the reaction a plot of equilibrium constant K vs 1/T Kelvin gave a line with a slop of -2100 K and y intercept of 4.53k. What is the value of standard enthalpy change for the reaction
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