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An undergraduate student weighed 20g of sodium
carbonate salt. If Na=23, O=16, carbon = 12and H=1, what is the mole of the hydroxide?
a photon of wavelength 40.0nm is used to eject an electron with the energy 22.3eV from a molecule.calculate the ionization energy of the molecule and tha associated wavelength of the elctron..
Calculate the distance NH3 gas and HCl gas would travel if a 100.0-cm tube were used, based on the accepted molar mass of the two gases
If the mass of the metal cylinder pictured below is 18.71 g, calculate the density of the cylinder.
In a calibration of a calorimeter, 50.0 g of water at 60.0 degrees C is added to 50.0 g of water at 20.0 degrees C to give a mixture 39 degrees C. What is the heat capacity of the calorimeter used in this experiment
A solution is made by dissolving 535 mg of this protein in 10.0 mL water. Calculate the osmotic pressure of this solution at 37.0°C in mm Hg.
advantages and disadvantages of consuming organic food
For each solution, calculate the number of moles of acid added. 3. For each solution, calculate the number of moles of OH- ion added.
A football is inflated to a pressure of 1.00 x 10^3 torr in a room at 25 degrees C. If the game is played at 10 degrees C, what will the pressure in the ball be, neglecting any volume change in the ball and assuming that it doesn't leak?
A buffer may be prepared by mixing a weak acid with a roughly equivalent amount of strong base. Which of the acids below is best for the preparation of a buffer with a pH of 4.00
What is the molarity of a 50% (by mass) NaOH. How did you find this value? Using this molarity, show that 13ml of 50% by mass NaOH diluted to 2200ml with distilled water yields a solution that is about 0.1M NaOH.
The inert pair effect is observed for : A) Group IIIA and Group IVA elements B) Group IVA elements C) Group IIIA elements D) group IIA elements E) group IA elements
Calculate the vapor pressure of a solution of 20 g of benzene (C6H6) and 20 g of toluene (C7H8) at 90 oC
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