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Twenty grams of a solute are added to 100g of water at 25C. the vapor pressure of pure water is 23.76 mmHg, the vapor pressure of the solution is 22.41 torr. calculate the molar mass of the solute.
Calculate the pH of each of the following solutions. (a) 0.115 M HONH2 (Kb = 1.1 10-8) (b) 0.115 M HONH3Cl
What is the energy per photon of the lowest frequency of electromagnetic radiation that can be used to observe a gold atom with a diameter of 280 picometers.
You have 50 mL of 0.010 fully protonated histidine. how many milimoles of base must be added to bring histidine solution to pH equivalent to the pI of histidine.
Calculate percent recovery of panacetin from the individual masses of its mictures, sucrose (.044g), aspirine (.093), and the unknown (.339).
A 180 kiln is used for vitrifying ceramics. It is currently operating at 1025 , and the pressure is 1.100 . How many moles of air molecules are within the confines of the kiln.
Equilibrium shift of the reaction and the pH of solution, 1. The pressure on each of the following systems is decreased from 5 atm to 1 atm. Which way does the equilibrium shift in each of the following systems?
If it takes 526 J of energy to warm 7.40 g of water by 17 °C, how much energy would be needed to warm 7.40 g of water by 55 °C?
What mass of HCl is contained in 30.0ml of a solution solution which is 37.2 mass% HCl has a density of 1.19g/ml.
For the reaction 2 HCl + Na2CO3 → 2 NaCl + H2O + CO2 what volume of 0.45 M HCl solution would be needed to produce 2.5 L of CO2 at STP
Calculate the binding energy of the 2s electron in iron and calculate the binding energy of the 2s electron in iron. Does the new energy agree better with experiment?
What are the major differences between "theories", "hypotheses" and "laws". What is an example that would explain them.
Molar mass from volumetric data, 2.64g of an organic base, isolated from a shrub in the mountains of Peru was dissolved in 100mL of water. 25.0mL of this solution required 27.5mL of 0.250mL HCL for complete neutralization
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