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50.% of the distintegrations of a sample of an unknown pure nuclide weighing 4.6 X 10-2 g were counted. In the first half-life of the sample, the total number of disintegrations counted was 2.15 X 1020 . What is the atomic weight of the unknown element?
If 14.0 mL of a 0.742 M solution of barium hydroxide is mixed with 25.9 mL of a 0.724 M solution of phosphoric acid, and 1.98 g of solid barium phosphate is collected once the reaction is complete, what is the percent yield of the reaction
a chemistry student has made some stock 0.2 moll potassium permanganate solution. he wants to make 800 ml of 0.04 moll
You want to prepare a pH=4.50 buffer using sodium acetate and glacial acetic acid. You have on hand 300 mL of 0.100 M sodium acetate. How many grams of glacial (water free) acetic acid should you add to prepare the buffer
Calculate the pKa value of the acid and determine the number of moles of acid initially present. b) When the reaction is complete, what is the concentration ratio of conjugate base to acid
You believe your unknown compound is acetanilide that melts at 114-115 degrees, so you ask your professor for a sample of the pure compound to do a mixed melting point. You do the experiment and determine the mixed melting point is 106-110 degrees..
The equilibrium constant at 25°C is 8.9 × 10-12. One hundred grams of magnesium hydroxide is added to 1.00 L of water and equilibrium is established.
Determine the amount of heat energy is needed to raise the temperature of 0.362 kilograms of Cu from 23. Degree Celsius to 60 degree Celsius?
calculate the work done when 65.0 g of tin dissolves in excess acid at 1.00 bar and 23degc. assume ideal gas
Balance the following skeleton reaction and include states of all reactants and products in your balanced equation.
if a sodium hydroxide solution were added to a solution containing leadii ions sodium ions nickelii ions and potassium
On a IR Spectrum chart, where would the one or two absorptions be located that distinguish the compound Diethl Ether
Draw the molecular orbitals for the following molecules CH20. Label the hybridization of all non-hydrogen atoms
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