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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?
Bonnie and Clyde are sliding 310 {rm kg} bank safe across the floor to their getaway car. The safe slides with a constant speed if Clyde pushes from behind with 440 {rm N} of force while Bonnie pull
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.
A dog sits 1.08 m from the center of a merry- go-round with an angular speed of 1.38 rad/s. If the magnitude of the force that maintains the dog's circular motion is 34.7 N, what is the dog's mass?
An 52.0 N box of clothes is pulled 6.7 m up a 30.0° ramp by a force of 107 N that points along the ramp. If the coefficient of kinetic friction between the box and the ramp is 0.22, calculate th
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.
A ship sets out to sail to a point 120 km due north. An unexpected storm blows the ship to a point 131 km due east of its starting point. (a) How far (in km) and (b) in what direction (as an angle f
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?
Two nonconservative forces are present: friction does -2.00 104 J of work on the car, and a chain mechanism does +3.00 104 J of work to help the car up a long climb. What is the change in the car's
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?
A 700 g mass is placed on a string and oscillates up and down with a period of 1.5 S. If a 1100 g mass were added to the current mass, what would be its period of oscillation?
Calculate the maximum mass of iron that can be obtained from these masses of reactants. Calculate the atom economy for this reaction
An airplane is flying in a horizontal circle at a speed of 106 m/s. The 82.0 kg pilot does not want the centripetal acceleration to exceed 6.76 times free-fall acceleration. Find the minimum radius
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?