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Light is emitted at 470 nm in an atomic emission experiment. Explain what the frequency of this emission band is.
A sample of H½O with a mass of 46.0 grams has a temperature of -58.0 C. How many joules of energy are necessary to melt 46.0 grams of ice? (Use 2.1 J/g.C for the specific heat of ice, and 334.4 J/g for the heat of fusion of water.)
Butanoic acid, CH3CH2CH2 COOH, is a weak acid. Which of the following would be the pH of a 0.01 M butanoic acid? the answer is > 2.0, but how would I figure that out
Calculate the vapor pressure lowering associated with the dissolving of 35.5 grams of sugar (C12H22O12, MM=343g/mol), in 400 grams of water at 25 degrees C. Ph2o @ 25 degrees=18.6 mmhg
If you had a mixture of benzoic acid (C6H5CO2H) and biphenyl (C6H5C6H5), how would you purify them based on solubility/recrystallization
From the following list of aqueous solutions and water, select the one with the lowest melting point. A. 1.0 M KNO3 B. 0.75 M NaCl C. 0.75 M CuCl2 D. 2.0 M C12H22O11 (sucrose) E. pure water
The initial concentration of some weak acid, HA, in an aqueous solution is 0.2530 M, at equilibrium the concentration of HA becomes 0.0957 mol/L. Calculate the Ka of the acid.
Some water dissolves in liquid methane at -161 degrees C, the boiling point of liquid methane, to give a solution in which the mole fraction of water is 6*10^-5. Determine the mass of water (in units of grams) dissolved in 115L of this solution if..
Explain what mass of NaOh is required to precipitate the Cd+2 ions from 40.0Ml of 0.460M Cd(NO3)2 solution
How many grams of magnesium oxide are formed when 16.4 of oxygen gas, measured at STP, completely reacts with magnesium metal according to this reaction
Suppose a sample of helium gas has a volume of 4.54L at 230.3K and 1.644 atm. Explain how many helium molecules does it contain
How much heat is required in kJ to melt 60.7 g of manganese at its melting point? The heat of fusion of manganese is 12.9 kJ/mol
What is the molarity of a sodium chloride solution if 2.45 grams of NaCl is dissolved in 250 mLs of water? C. How many grams of solute are in 1.75 Liters of 0.460 M sodium monohydrogen phosphate
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