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calculate the molecular mass of the nonionic solutes: 64.3 grams of solute in 3.90 x 10^2 grams of water raises the boiling point to 100.680 degrees celsius.
Find the Ka for benzoic acid (C6 H5COOH and then find pH of a buffer solution that is prepared with 100 mL of 0.10 M benzoic acid mixed with 100 mL of 0.10 sodium benzoate (NaC6 H5COO) solution.
A gas mixture contains helium and oxygen at respective partial pressures of 255 torr and 0.450 atm. What is the total pressure in mm Hg of the mixture?
used the 8900 kilojoules you expend in energy in one day to heat 50000 of water at 20, what would be the rise in temperature?
Calculate the mass of helium that it would take to fill the balloon. Be sure to follow significant figure rules when calculating the answer.
At 80 deg C the vapor pressures of pure liquids X, Y, Z are 385, 190, 66 mm Hg, respectively. What pressure must be exerted on the surface of a solution containing one mole of X, three moles of Y, a
Given the equation A(aq) + 2B(aq) 3C(aq) + 2D(aq). 45.0 mL of 0.050 M A is mixed with 25.0 mL 0.100 M B. At equilibrium the concentration of C is 0.0410 M. Calculate K.
In an experiment similar to the empirical formula experiment in the lab book, a student reacted beryllium and oxygen from the air. The initial mass of beryllium was 0.915 g. The final product had a
It takes 217 kJ/mol to eject electrons from a certain metal surface. What is the longest wavelength of light (nm) that can be used to eject electrons from the surface of this metal via the photoele
Given 1.50g of NH3 reacts with 2.75g of O2 which is the limiting reactant? How many grams of the excess reactant remain after the limiting reactant is completely consumed?
Calculate the wavelength of the electromagnetic radiation required to excite an electron from the ground state to the level with n = 5 in a one-dimensional box 39.8 pm in length.
Calculate the molar mass of a nonelectrolyte that lowers the freezing point of 25.00 g of water to -3.9 degrees Celsius when 4.27 g of the substance is dissolved in the water.
A sample of pure NO2 is heated to 336 degree Celsius at which temperature it partially dissociates according to the reversible equation.
A zero-order reaction has a constant rate of 2.50×10-4 . If after 35.0 seconds the concentration has dropped to 1.00×10-2 , what was the initial concentration?
Calcium chloride is used to melt ice and snow on roads and sidewalks and to remove water from organic liquids. Calculate the molarity of a solution prepared by diluting 165 mL of 0.688 M calcium chl
A 13 gram sample of calcium reacts with bromine to form 24 grams of calcium bromide. How many grams of bromine are used in the reaction?
Near the triple point (T=273.15K), the vapor pressure of ice is given by ln(P)= -5924/T + 2.72ln(T)-0.0072T + 9.912 where P and T are expressed in torr and K, respcetively.
Calculate the number of moles of carbon monoxide released in the reaction, given that 1.40 mol of manganese were produced.
Arrange the elements in order of decreasing ionization energy. Rank elements from largest to smallest. To rank items as equivalent, overlap them.
The acid-dissociation constants of phosphoric acid (H3PO4) are Ka1 = 7.5 × 10-3, Ka2 = 6.2 × 10-8, and Ka3 = 4.2 × 10-13 at 25.0 °C.
When she introduced 0.116 moles of NO(g) and 9.28E-2 moles of Br2(g) into a 1.00 Liter container, she found the equilibrium concentration of NOBr(g) to be 7.85E-2 M.
Sodium metal reacts violently with water to form NaOH and release hydrogen gas. What is the molarity of the NaOH solution formed by the reaction.
Calculate the percent yield for an experiment in which 5.50 g of SOCl2 was obtained in a reaction of 5.80 g of SO2 with excess PCl5. Use the following equation:
The equivelence point is reached when 35.31 mL of KOH base has been added. What is the hydroxide ion concentration at the equivelence point? The Ka of propionic acid is 1.34 E -5.
Mixing solutions of k2so4(aq) and bacl2(aq) produces an insoluble salt. Which is the correct list of the ions which will form the solid precipitate?