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Question- How much time in years (assume a 365 day year for each year) would it take for a 2.849 g sample of 128Ba to decay to a mass of 1.136 g if it has a half-life of 2.0995e+5 s.
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375.00 mL of a 0.010 M solution of NaCl are condensed down to 167.00 mL. Assuming the solution does not become saturated during this process, what is the final concentration of NaCl
In a cell constructed between a compartment containing a zinc electrode immersed in a 0.1 M ZnSO4 (aq) solution and a compartment containing a copper electrode immersed in a 0.1 M CuSO4 (aq) solution,
a 2.0 liter flask was filled with 4.00 mole nh3 g and heateduntil the nh3 g partially decomposes. after equilibrium
The oxygen sample burned in sodium to form sodium oxide, Na2O - write a balanced equation for the reaction.
As early as 1938, the use of NaOH was suggested as a means of removing CO2 from the cabin of a spacecraft according to the following (unbalanced) reaction: NaOH + CO2 → Na2CO3 + H2O.
Calculate the Pickering series wavelength associated with the excited state ni = 8. What region of the electromagnetic spectrum does this transition fall in?
A 1.3717-g sample of impure oxalic acid dihydrate, H2C2O4·2H2O, required 34.49 mL of 0.1211 M NaOH for titration to the phenolphthalein end point (both protons neutralized). Calculate the percent oxalic acid dihydrate in the sample.
An avergae 70-kg adult human contains 170g of potassium. 0.0118% of naturally occuring potassium is potassium-40, which is a beta emitter with a half life of 1.28x109 years. What is the total activity (in counts per minute) of a human being, due s..
The addition of S2- ion to Fe(OH)2(s) results in the formation of FeS(s). Explain why the addition of S2- ion to Cr(OH)3(s) does not result in the formation of Cr2S3(s).
a tanker truck carrying 6.05times103 kg of concentrated sulfuric acid solution tips over and spills its load. the
A mixture containing 0.538 mol He(g), 0.315 mol Ne(g), and 0.103 mol Ar(g) is confined in a 7.00-L vessel at 25 degree Celcius. Compute the partial pressure of each of the gases in the mixture.
A reaction was performed in which 0.30 mL of 3,7-dimethyl-3-octanol was reacted with concentrated hydrochloric acid to make 0.25 g of 3-chloro-3,7-dimethyloctane. 1) Calculate the theoretical yield and percent yield for this reaction.
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