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What could be the possible sources of error for this experimental outcome?be specific and give at least two possible reasons.
What is the molality of ethanol in a solution prepared by dissolving 5.00 mL of ethanol (C2H5OH, of density 0.800 grams/mL) in 25.0 mL of water (H2O, of density 1.000 grams/mL)?
What is relative amount of electric energy that will need to be used in both cases to cool a can of water (330 ml) from room temperature to +8 oC? Assume ideal operation of both systems.
If 50.00 mL of 1.00 M HC2H3O2 (Ka= 1.8 x 10^-5) is titrated with 1.00 M NaOH. what is the pH of the solution after the following volumes of NaOH have been added.
25 mL of 0.100 M lactic acid ( Ka= 1.4 x10^-4) is titrated with 0.097 M KOH. What is the pH of the solution before titration?
A sample of propane, C3H8, contains 10.8moles of carbon atoms. How many total moles of atoms does the sample contain?
The concentrations are [H2CO3] = 0.0012 M and [HCO3-] = 0.024 M. pKa for carbonic acid = 6.1. Explain why the pH of blood is 7.4.
Calculate the entropy of unfolding of lysozyme at 25 oC, given that the difference in C P of unfolding is 6.28 kJ/mol/K at both 25 oC and 75 oC.
Suppose, instead, that the heat capacity depends on the temperature as C = a+ bT+ a2 . Find an expression for the change in entropy accompanying heating from Ti to Tf.
Evaluate reversibility of a process where an ideal monoatomic gas is first slowly compressed 10- fold by a gradually increasing external pressure.
How many kilojoules of heat are absorbed when 40.4g of MgO(s) is decomposed into Mg(s) and O2(g) at constant pressure?
What volume of a 0.310 M NH4I solution is required to react with 979 mL of a 0.500 M Pb(NO3)2 solution?
40 g of liquid Nitrogen (boiling point = -190 C) is poured into a styrofoam cup containing 200 g of water at 50.5 C. Calculate the molar heat of vaporization of liquid Nitrogen if the final tempera
75.0 g of H2O at 23.0 oC is added to 100.0 g of H2O at 67.5 oC. What is the temperature of the resulting mixture?
Assume that patient blood lead levels are 0.590. What minimum mass of succimer in milligrams is needed to bind all of the lead in a patient's bloodstream?
The Kw for the dissociation of H2O varies with temperature. At 90°C, Kw = 1.0 x 10-13. explain why pH = 6.5 is neutral at this temperature and why pH = 7 is basic.
Calculate ΔH°rxn for this reaction. ΔH°f [NaNO3(s)] = -467.8 kJ/mol; ΔH°f [NaHSO4(s)] = -1125.5 kJ/mol; ΔH°f [H2SO4(l) = -814.0 kJ/mol; ΔH°f [HNO3(g
Is it possible to separate Ca2+ from Mg2+ by selective precipitation of Mg(OH)2? To be precise, is it possible to precipitate 99.99% of magnesium without precipitating any calcium as hydroxides?
Calculate the maximum mass of iron that can be obtained from these masses of reactants. Calculate the atom economy for this reaction
An unknown liquid has a density of 2.14 g/mL. How many mL would a 6.42 g sample of this liquid occupy if dispensed into a 5 mL UV/VIS spectrophotometer cuvette?
The Hydrogen gas which is released in the reaction is collected over water at 25 C. The vapor pressure of water at 25 C is 23.8 mmHg. If 3.557 L, at a total pressure of 747 mmHg, are collected, how
A 3.90-L sample of carbon monoxide is collected at 55°C and 0.901 atm. What volume will the gas occupy at 1.05 atm and 25°C?
what is the maximum amount of O2 in grams that can be obtained from 2.00x10^2 of nitroglycerin? calculate the percent yield in this reaction if the same amount of O2 generated is found to be 6.55g.
A student obtains a vinegar solution having an acetic acid concentration of 0.8512 M. What volume of 0.1036 NaOH will be required to reach the equivalence point when 25 mL of the vinegar solution is
What is the maximum oil level in tank 2? Assume laminar flow in the horizontal pipes, and neglect kinetic, entrance-exit losses.