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Thomas poured 25 mL of .60 M HCl into a large bottle. He then added enough water so that the new (diluted) concentration was 0.10 M HCl. How much water did Thomas add?
The vessel contains 2.00 moles of nitrogen, 2.00 moles of helium, and 5.00 moles of krypton. What is the partial pressure of krypton?
A 235mL solution is prepared with 41.8 millimoles of an unknown sodium salt of a deprotonated organic acid (NaX). If the solution has a pH of 8.05, what is the pKa of the acid?
More realistically, the principal components of meat are fat, protein, and water. Water is acetone soluble. Based on this information, the calculations correctly calculate what quantity, % fat or %
The total strand concentration C that is duplex is defined as f. If the strand concentration is 1.00 X 10^-4 M, calculate the equilibrium constant at the melting temperature.
what is the molarity of HCl in a solution prepaired by dissolving 18.25 gm HCl in 200 gm ethanol, if the density of solution is 0.86 gm per mm.
A compound has the empirical formula CH2O. When 0.0866g is dissolved in 1.000g of ether, the solution's boiling point is 36.5 degrees C. Determine the molecular formula of this substance.
What is the concentration (M) of CH3OH in a solution prepared by dissolving 16.8 g of CH3OH in sufficient water to give exactly 230 mL of solution?
What is the broglie wavelength of an electron moving at one-tenth the speed of light. mass of the electron = 9.109* 10^-28
Consider 1.5 kg of austenite containing 1.15 wt% C, cooled to below 727 degrees Celcius (1341 degrees Farenheit). a) What is the proeutectoid phase?
The vessel contains 5.00 moles of hydrogen, 2.00 moles of helium, and 2.00 moles of krypton. What is the partial pressure of helium?
The first order rate constant for a reaction at 700 oC is 8.98e-03 s-1. If the activation energy for the reaction is 340 kJ/mol, what is the rate constant at 800 oC?
Estimate the enthalpy change for the combustion of one mole of acetylene, C2H2, to form carbon dioxide and water vapor. Start by writing the balanced combustion reaction.
What molar ratio of sodium acetate to acetic acid (NaAc/HAc) should be used in preparing a buffer having a pH of 4.35? (Ka = 1.8×10-5 for acetic acid.)
What are the technique that we encounter in the experiment of preparation of standard solutions and standardization of hydrochloric acid solution with primary standard sodium carbonate solution
If 5.50 of the unknown compound contained 0.183 of and 0.367 of , how many moles of oxygen, , were in the sample?
A phosphorous acid buffer needs to be prepared to a pH of 5.92; given a 120mL solution of 25mM phosphorous acid, how many milliliters of either 0.5M KOH or 0.4M HCl will need to be added to the solu
What is the rate constant of a first-order reaction that takes 2.50 minutes for the reactant concentration to drop to half of its initial value?
Compare the bonding in S-Cl with S-OH in Sulphur (VI) compounds and attempt to rationalise the reactivity of the chloro-derivatives of Sulphuric acid with water?
A gas occupying a volume of 428 mL at a pressure of 0.970 atm is allowed to expand at constant temperature until its pressure reaches 0.541 atm. What is its final volume?
A stainless steel spoon weighs 25.2 g and is at a temperature of 18.5 oC. It is immersed in 81.7 mL of hot coffee (T = 84.0 oC) in a Thermos flask. What is the final temperature of spoon + coffee?
Sulfuric acid is a diprotic acid with the formula H2SO4. Phosphoric acid is a triprotic acid with the formula H3PO4. Which will have a lower pH as aqueous solutions? A 1 M solution of H2SO4 or a 1M
What conversion factor is present in almost all stoichiometry calculations?
The most common source of copper Cu) is the mineral chalcopyrite CuFeS_2). How many kilograms of chalcopyrite must be mined to obtain 355 g of pure Cu?