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A proton in a linear accelerator has a de Broglie wavelength of 144 rm pm. What is the speed of the proton?
Pure ethanol has a density of 0.78945 g/cm ³ at 20.0 °C and 0.80625 g/cm³ at 0.0° C. What will be the difference in mass that a 500.0mL flask will hold at 0.0°C from that at 2
A meteorological ballon contains 250.0L He at 22 degrees celsius and 740.0mm Hg. If the volume of the ballon can vary according to external conditions, what volume would it occupy at an altitude at
After you preform your experiment, you determine that the Kf value for naphthalene is 6.91 . You are using 10g of naphthalene and added 1.0 g of your unknown. The the freezing point of the solvent
A gas confined in a 519.1-mL container exerts a pressure of 107 mm Hg at 38.6 degrees Celsius. At what Celsius temperature will it exert a pressure of 635.7 mm Hg if it is placed into a 644 mL conta
A solution of ammonia and water contains 3.30×1025 water molecules and 7.00×1024 ammonia molecules. How many total hydrogen atoms are in this solution?
Given the pK for acetic acid is 4.76. Suppose that we dissolve a mole of this weak acid in 10L of water. Find the pH of the resulting solution. What fraction of acetic acid molecules is dissociated
what is the mass of pentane that vaporizes? density is .626g/mL and pure vapor pressur eis 511 at 25 degree celcius. suppuse hexane and pentane each 75 ml is mixed in previoulsy evacuated 200 ml at
A 4.50-g sample of LiCl at 25.0 C dissolves in 25.0 mL of water also at 25 C. The final equilibrium temperature of the resulting solution is 60.8 C. What is the enthalpy, delta H, of LiCl expressed
When power was turned off to a 30.0 gal. water heater, the temperature of the water dropped from 75.0°C to 22.5°C. How much heat was lost to the surroundings? (1 gal = 3.785 L) Assume the d
Consider the following reaction: 3Li + Z = Li3Z-What is the formula for the compound if we substitute sodium for lithium?
In the formula for sodium phosphate (Na3PO4) how many moles of sodium are represented? How many moles of phosphorus? how many moles of oxygen?
Commercial vinegar was tritrated with NaOH solution to determine the content of acetic acid (HC2H3O2). For 20.0 milliliters of vinegar, 26.7 milliliters of 0.600 molar NaOH solution was required. Wh
How many grams of KNO3 must be added to 275 mL of water to produce a solution that freezes at -14.5 degrees? The freezing point for pure water is 0.0 degrees and Kf is equal to 1.86 C/m.
At a particular temp, K=3.75 SO2+NO2 reverse arrows SO3+NO If all four gases had initial concentrations on .800, calculate the equilibrium concentrations on the gases
A 30 g sample of water at 280 K is mixed with 50 g of water at 330 K. Calculate the final temperature of the mixture assuming no heat loss to the surroundings.
Suppose you get the same data that you recorded in your lab but you mistakenly thought the mol ratio of acetylsalicylic acid:NaOH was 2:1 respectively. How would your percent acid in aspirin compare
A rod 8.6 cm long is uniformly charged and has a total charge of -26.1 μC Determine the magnitude of the electric field along the axis of the rod at a point 40.8268 cm from the center of the rod
The particle has Z = 2 and a negatively charged participle that is the same charge as the electron but 207 more massive. Compute the energy of the negatively charged particle if it is in its 10th Bo
During photosynthesis, an electron is believed to travel 25 Angstroms within one picoseconds. Calculate the uncertainty in the distance of the electron (in Angstroms) at any point during its 25 Angstr
Calculate the molarity of a solution of glycerol made by dissolving 46.000 mL glycerol at 15 ^circ {rm C} in enough water to make 400.00 mL of solution.
Calculate the amount of heat evolved in the complete oxidation of 8.17 g of Al at 25oC and 1 bar pressure. The standard heat of formation of Al2O3 is -1676 kJ/mol. 4 Al(s) + 3 O2(g) 2 Al2O3(s).
A .483 mol sample of graphite was heated with 2.14 mol oxygen gas to form carbon dioxide. Graphite is the limiting reagent in this reaction. Calculate the total moles of gas present after the react
A 345 mL container holds 0.146 g of Ne and an unknown amount of Ar at 35°C and a total pressure of 620 mmHg. Calculate the moles of Ar present.
On the X scale the boiling point of water is 122 and the freezing point of water is 16. At what temperature will the readings on the Fahrenheit and X thermometers be the same?