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We read the absorbance of an unknown Zn2+ solution and find 0.457 by AAS at the Zn wavelength. 20.0 mL of that unknown solution is spiked with 3.00 mL of 250 ppm Zn2+ resulting in a solution with an absorbance of 0.722 under the same conditions. What is the concentration of Zn2+ in the unknown?
hat mass of KOH, in grams, is required to prepare 125 mL of 2.35 M KOH solution? How many grams of NaOH will react completely with 187 ml of 0.430m HCl?
The box is then heated to 500K, which causes the ammonia to partially decompose to Nitrogen and Hydrogen and results in a final pressure of 4.85*10^6 pa. Find the number of moles and partial pressure of all three gases at 500K. What is the average..
Morphine is 71.56% C, 6.71% H, 4.91% N, and 16.82% O as well as its molecular weight is 285 g/mol. Explain what is its molecular formula
assume you dissolve 2.56g of malic acid c4h605 in half a liter of water 500g. calculate the molarity molality mole
Copper metal reacts with hot concentrated sulfuric acid solution to form aqueous copper (II) sulfate, sulfur dioxide gas, and water
Question- The solubility product for MgF2 is Ksp= 8.0 E-8. Calculate the molar solubility's, of MgF2 in a solution that is 0.10M in NaF. The correct answer is supposed to be 8.0 E-6 M
Describe the primary objective of statistical process control.
Question- Chemists commonly use a rule of thumb that an increase of 10 K in temperature doubles the rate of a reaction. What must the activation energy be for this statement to be true for a temperature increase from 18°C to 28°C
Mercury is a poisonous metal that is used in thermometers. When mercury is at temperatures below its freezing point it has a simple cubic unit cell. How many atoms of Hg are present in each unit cell
The standard free energy of activation of a reaction A is 76.9 kJ mol-1 (18.4 kcal mol-1) at 298 K. Reaction B is one hundred million times faster than reaction A at the same temperature
Calculate the work done if a gas is compressed from 8.1 L to 3.9 L at constant temperature by a constant pressure of 2.3 atm, and give your answer in units of joules.
At 25 degrees C and constant pressure, carbon monoxide gas combines with oxygen gas to give carbon dioxide gas with the evolution of 10.1 kJ per gram of carbon monoxide consumed. What is the value of ^H for the balanced reaction?
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