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A 2.10 M aqueous soluion of pyridine C6H5N has a pH 0f 9.78. Why are the concentration of these solutions diffferent even though their pH values are the same?
A rifle with a barrel length of 60 fires a 10 bullet with a horizontal speed of 450 . The bullet strikes a block of wood and penetrates to a depth of 10 .
What is the percent by mass of sodium phosphate in a 0.142M Na3PO4(aq) solution that has a density of 1.015g/mol.
A solution is prepared by adding 6.24 g of benzene(C6H6, 78.11g/mol) to 80.74g of cyclohexane (C6H12, 84.16 g/mol). Calculate the mole fraction and molarility of benzene in the solution. ANS: mole f
What work would you have to do to now move the negative charge back to infinity?
Which ligand, NH3 or EN, produces the more stable complex cations as indicated by their Kf values? Which metal ion, Cu2+ or Zn2+, forms the more stable complex cation for a given ligand? Explain yo
An object is being acted upon by three forces and moves with a constant velocity. One force is 60.0 N along the x-axis, the second is 75.0 N along a direction making a counterclockwise angle of 150.
The mixture is to be& ; separated in a phase column at 333.15 K. By assuming Raoult's law is applied to the system, determine the range of pressures that this system can exists as two phases.
What is the mass, in kilograms, of Avogadro's number of olympic shot put balls if each one has a mass of 16lb? How does this compare with the mass of Earth, 5.98x10^25 kg?
A 51.0-mL volume of AgNO3 solution contains 0.0273 mol AgNO3 (silver nitrate). What is the molarity of the solution?
A cart traveling at 0.3 m/s collides with stationary object. After the collision, the cart rebounds in the opposite direction. The same cart again traveling at 0.3 m/s collides with a different stat
A 500.0 gram sample of aluminum is initially at 25.0°C. It absorbs 32.60 kJ of heat from its surroundings. What is its final temperature if aluminum has specific heat of 0.9930 J/g°C.
If 2.50 mol of copper and 5.50 mol of silver nitrate are available to react by single displacement, identify the limiting reactant.
Calculate the enthalpy change for converting 10.00g of ice at -25.0°C to water at 70.0°C in kJ. The specific heats of ice, water.
What is the control of the boyle's law in a bottle lab?
If a sample of a compound of carbon and oxygen contains 3.00g of carbon and 8.00g of oxygen, what is the mass percent of carbon in the compound?
When 20 mL of a 315 mL stock solution containing 2.2 M AlCl3 is diluted to 81 mL, what is the concentration of Al3+ in the new solution?
The first person is initially moving forward with a speed of 2.50 m/s, and the second person is initially at rest. What are the velocities of the two people after the snowball is exchanged? Disregar
A hard water sample contains 121 mg of CaCO3 per liter of water. Assuming the reaction goes to completion, calculate the mass of Na3PO4 needed to remove all Ca^2+ ions from 2.50 L of the water sampl
What is the total sample size (in grams) for a sample of disulfur octoxide which contains 3.52 g of oxygen?
How many grams of methanol must be added to 7.50kg of water to lower its freezing point to -15.0^circ C? For each mole of solute.
A loudspeaker of mass 16.0 is suspended a distance of = 2.20 below the ceiling by two cables that make equal angles with the ceiling. Each cable has a length of = 4.00 .
Prepare solution by dissolving .702g of Fe(NH4)2(SO4)2·6H2O in 50mL of water containing 1 mL of concentrated H2SO4. transfer solution completely to a 1L volumetric flask and dilute to exactly
How much energy in kilojoules is required to convert 260 mL of water at its boiling point from liquid to vapor?
A 1.630 -,g sample of naphthalene, C10H8(s)is completely burned in a bomb calorimeter assembly and a temperature increase of 8.46 degrees Celsiusis noted. If the heat of combustion of naphthalene i