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Explain a mammoth skeleton has a carbon-14 decay rate of 0.49 disintegrations per minute per gram of carbon (0.49 dis/min gC). While did the mammoth live? Presume that living organisms have a carbon-14 decay rate of 15.3 dis/min gC as well as that carbon-14 has a half-life of 5730 yr)
next titrates an unknown sample with this DCP solution and reaches the end point at 40.5 mL. How many mg of ascorbic acid were present in the unknown sample
A mixture is prepared using 25.00 mL of 0.08000 M aniline, 25.00 mL of 0.06000 M sulfanilic acid and 1.00 mL of 1.230 × 10-4 M HIn and then diluting to 100.0mL, where HIn is the protonated indicator. The absorbance measured at 550nm in a 5.000 cm ..
Use the following data to calculate the combined heat of hydration for the ions in sodium acetate (NaC2H3O2): Hlattice = 763 kJ/mol; Hsoln = 17.3 kJ/mol
You identified your unknown compound. How you could use this compound to determine the Kf value for ethyl alcohol? Explain what you would do experimentally.
find the specific solubilities (in g/100g H2O) in both cold and hot water for AgCl, PbCl2, and Hg2Cl2.
4.00g of H2SO4 solution was diluted with H2O and added with excess of cacl2, and The washed and dried precipitate of BaSO4 weighted 4.08g. Calculate percent H2SO4 in the original acid solution.
Enough of a monoprotic acid is dissolved in water to produce a 0.0193 M solution. The pH of the resulting solution is 6.31. Calculate the Ka for the acid.
A sample of 0.255 mole of gas has a volume of 748 mL at 28°C. Calculate the pressure of this gas. (R= 0.0821 L · K)
Predict whether each of the following should form a normal or inverse spinel (hint: think about CFSE's): MgV2O4, VMg2O4, NiGa2O4, ZnCr2S4, NiFe2O4, Mn3O4, Fe3O4
How many photons will be required to raise the temperature of 2.3 g of water by 2.1k ? Water is exposed to infrared radiation of wavelength 2.7×10?4 cm . Assume that all the radiation is absorbed and converted to heat.
Determine the volume of 0.210 M KOH solution required to neutralize each of the following samples of sulfuric acid. The neutralization reaction is: H2SO4(aq)+ 2KOH(aq) â†' K2SO4(aq)+ 2H2O(l)
When a positron and an electron collide and annihilate each other, two photons of equal energy are produced.
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