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For a first ordwr reaction theconcentration of the reactant was reduced from .0150 M to .0120 M after heating at 500 c for 150 s. What was the concentration of the reactant after 250 s? What was the half life?
You have 500.0 mL of a buffer solution containing 0.30 M acetic acid (CH3COOH) and 0.20 M sodium acetate (CH3COONa). What will the pH of this solution be after the addition of 20.0 mL of 1.00 M NaOH solution
Three 5.00mL samples of this solution are titrated with DCP that had a standardized concentration of 9.94x10-4M. The three titrations took an average of 27.51mL of DCP. (MM Ascorbic Acid = 176.124 g/mol) Calculate the mass (in mg) in the vitamin C ..
Lead has a face-centered cubic lattice with all atoms at the lattice points and a unit-cell edge length of 495.0pm its atomic mass is 207.2 amu what is the density of lead?
boron has two stable isotopes with masses of 10.01294 u and 11.00931 u. the average molar mass of boron is 10.81 u.
A sample of pure calcium fluoride with a mass of 15.0 g contains 7.70 g of calcium. How much calcium is contained in 45.0 g of calcium fluoride.
Consider the peaks for pentafluorobenzene (12.98min) and benzene(13.20min) in the chromatogram shown above. The elution timefor the unretained solute is 1.06 minutes. The open tubularcolumn is 30.0m in length and 0.530mm in diameter, with a layer ..
Calculate the temperature at which k = 10.0 s-1 if k = 5.00 s-1 at 318 K. The activation energy for the reaction is 45.0 kJ mol -1
how many atoms of aluminum can be produced by the decomposition of 31.5 g of aluminum oxide
Examine the nuclide neptunium-237. The nuclide has a measured nuclear mass of 237.048166 amu. Determine the binding enery in kj, kj/mole
Write balanced net ionic equation for the neutralization of equal molar amounts of HNO_2 and KOH
2c4h10 13o2 rarr 8co2 10h2othe equation shows the combustion of butane c4h10. how many moles of water can be produced
if a piece of aluminum with mass 3.90 g and a temperature of 99.3 degrees celcius is dropped into 10.0 cm cubed of
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