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A 1.00 g sample of carbon from rolls of parchment found near the dead sea undergoes 1.4 x 10 * 4 decay of carbon-14 in 20 h. What is the approximate time passed since one were used to make these rolls knowing that for a living one gram of carbon produced 15.3 disintegrations per minute.
Analysis of an unknown substance showed that it has a moderate melting point and is a good conductor of heat and electricity in the solid phase. Which of the following substance would have those characteristics
Problem- The Kb for an amine is 7.280x10^-5. What percentage of the amine are protons red if the pH of a solution of the amine is 9.408? Assume that all OH- came from the reaction of B with H2O
The Ka for cacodylic acid (C2H7AsO2) is 5.37 x 10-7. An amount (0.1035 g) of this compound is added to 0.5 L H2O. What is the resulting pH of this solution
How much concentrated hydrobromic acid solution (48.0% HBr by mass, d = 1.52 g/mL), in milliliters, is required to produce 10.0 L of 0.185 M HBr
What is the pH of a solution that results from addition of 100 ml of 1 M HCl (a strong acid) with 100 ml of 1 M NaOH (a strong base)?
what mass of KO2 in grams is required to react with 8.90-L of CO2 at 22.0 C and 767mm Hg? first calculate the number of moles of CO2 (R=0.08026 L*atoms/ mol*K) find moles of Co2 and mass of KO2 in grams?
What concentration of CrO4-2 is needed to precipitate as much Ba+2 as possible without precipitating the Ca+2. (BaCrO4:Ksp=2.1x10^-10; CaCrO4:Ksp=7.1x10^-4)
Calculate the molarity of a solution that contains 0.500 mol of AgNO3 dissolved in 250 mL of solution.
Compared to benzene, would each of the following compounds be more or less reactive than benzene in an electrophilic aromatic substitution reaction
the mass of a cube of iron is 434 g. iron has a density of 7.87 gcm3. what is the mass of a cube of lead that has the
A 15.0-g sample of aluminum (specific heat = 0.902 J g-1 oC-1), initially at 95.0oC, is immersed in a 35.0-g sample of water (specific heat = 4.184 J g-1 oC-1), initially at 44.2oC, in an insulated container.
Define and distinguish between the terms rate and rate constant. Give the units of k for 1st order, 2nd order, 1.5 order, and zeroth order reactions.
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