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To what final volume would 100 mL of 6.0 M NaCl have to be diluted in order to make "physiological saline" (0.54 M NaCl)?
Silver has an average atomic mass of 107.87 u. If 48.18% of Ag exists as Ag-109 (108.9047 u), what is the identity and the atomic mass of the other isotope?
Write an equation to show how the base NaOH(s) behaves in water. Include states of matter in your answer.
there is no measurable difference between final and initial pH - that is why it is called a buffer E. final pH is 0.16 pH units lower than original pH
The reactant concentration in a first order reaction was 5.50x10^-2 M after 40.0s and 1.60x10^-3 M after 100s. What is the rate constant for this reaction
chemiluminescence reaction will actually occur very slowly in air. What component of air will bring about this reaction and what is its approximate concentration in air?
Calculate the molarity of urea in a soln prepared by dissolving 16 g of urea (MM= 60.0 g/mol) in 39 g of H20. The density of the soln is 1.3 g/ml.
Draw a complete lewis structure that shows all bonds, unshared electron pairs, and minimized formal charges where appropriate.
What is the value of the equilibrium constant at this temperature for the reaction of SO2 with N2O to form SO3 and N2 (balanced with lowest whole-number coefficients)?
What is the mass percent of ethylene glycol (C2H6O2) in a solution of ethylene glycol in water that has a freezing point of -15C? (Kf for water is 1.858C/m.)
a 54.1 gram sample of an unknown hydrocarbon was burned in an excess of oxygen to form 88.0grams of carbon dioxide and 27.0grams of water. what is a possible molecular formula for the hydrocarbon?
a) What is the structure of biacetyl? b) Indicate the hybridization of each carbon atom. c) How many pi bonds are present? d) Do the four carbon atoms lie in a plane or do they lie in a straight line?
calculate the standard enthalpy of reaction C6H6 (I) +3H2 (g)® C6H12 (I) from standard enthalpies of combustion of substances.
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