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If you have 44.6 g of carbon tetrachloride, how many atoms of chlorine do you have? How many grams of sulfur hexafluoride would you need to have 5.25 x 1024 fluorine atoms? A 1.443 g sample of metal is reacted with excess oxygen to yield 1.683 g of the oxide M2O3. Calculate the atomic mass of the element M.
60.0 mL of a 0.450 M HNO_3 solution is titrated with 0.570 M KOH. Calculate the volume of KOH required to reach the equivalence point.
What is the pH of an acetic acid-potassium acetate buffer if the salt concentration is 40% higher than that of the acid
If 2.50 L N2 react with 7.00 L H2, what is the theoretical yield (in liters) of NH3? Assume that the volumes of reactants and products are measured at the same temperature and pressure.
Joe Schmoe mixed peroxide with yeast to generate oxygen gas and collected the gas in a graduated cylinder, using the same set up as was used in Experiment 11. He collected the following data
Chemical analysis of the two compounds reveals that 0.25 mol ACl 2 has a mass of 100.0 g and 0.50 mol BCl 2 has a mass of 125.0 g. Determine what are the molar masses of ACl 2 and BCl 2 ?
In the combustion of propane for energy, how many kilojoules of heat are produced when 2 kilograms of propane are completely combusted in the presence of excess oxygen
What mass of Al (26.89 amu) is consumed when 800. kJ of heat are released by the following reaction? 2Al(s) + Fe2O3(s) -> 2Fe(s) + Al2O3(s) deltaH = -850. kJ
HEPES are synthetic amine compounds that are often used to make buffers for biochemical studies. What is the pH of a 1.0 L buffer solution that is 0.250M HEPES
15.0 mL of 0.50 M NaOH is added to a 100.-mL sample of 0.376 M NH3 (Kb for NH3 = 1.8 x 10^-5. What is the equilibrium concentration of NH4^+ ions? The answer is 9.0 x 10^-5 M.
A child has a dangerous blood lead level of 120ug/100mL. If the child is administered 100 mL of 0.10M Na2 Ca(EDTA), assuming the exchange reaction
Use the data given to calculate an overall energy change (in kilojoules per mole) for the formation of CsF2 from its elements.
An unknown compound B has the melting point 112.5-114 degrees C. It is suspected that B is either X or A, each compound having reported mps of 115degreesC. Assuming B is X, indicate the mp range (give actual values) for the Melting points
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