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A tree killed by being buried under volcanic ash was found to have a ratio of carbon-14 atoms to carbon-12 atoms of 4.3 × 10-14. The rate constant of the C-14 → C-12 decay is k = 1.21 × 10-4 yr-1 and the ratio of carbon-14 to carbon-12 is 1.2 × 10-12 in a contemporary sample. Hydrogen sulfide burns in oxygen to form sulfur dioxide and water. If sulfur dioxide is being formed at a rate of 0.43 mol L-1 s-1, what are the rates of disappearance of hydrogen sulfide and oxygen? The decomposition of N2O5 has an activation energy of 103 kJ/mol and a frequency factor of 4.3 × 1013 s-1. What is the rate constant for this decomposition at 25 celsius and 373 K The decomposition of urea, (NH2)2CO, in 0.10 M HCl follows the equation (NH2)2CO(aq) + 2H+(aq) + H2O 2NH4+(aq) + CO2(g) At 65°C, k = 5.84 × 10-6 min-1 and at 75°C, k = 2.25 × 10-5 min-1. If this reaction is run at 85°C starting with a urea concentration of 0.0087 M, how many minutes will it take for the urea concentration to drop to 0.0012 M? If it takes 78.7 min for the concentration of a reactant to drop to 20.0% of its initial value in a first-order reaction, what is the rate constant for the reaction in the units min-1? The decomposition of acetaldehyde, CH3CHO, was determined to be a second order reaction with a rate constant of 0.0771 M-1 s-1. If the initial concentration of acetaldehyde is 0.225 M , what will the concentration be after selected reaction times? after 30 min? after 180 min?
glycerol rmc3 rmh8 rmo3 is a substance used extensively in the manufacture of cosmetics foodstuffs antifreeze and
What will be the concentration of all species present, excluding water, when the reaction is at equilibrium?, c) What will be the pH., d) what will be the percent ionization
In a 0.400 mol/kg aqueous solution of sucrose, the molarity of sucrose is 0.282 mol/dm3 and the density of water is 0.998 g/cm3 at 20oC and 1 atm. Estimate the osmotic pressure of this solution.
By what percentage does a dilute aqueous solution expand when heated from 15 degrees to 25 degrees C? If a 0.5000M solution is prepared at 15 degrees C, what would molarity be at 25 degrees C?
If an ion having 4+ charge and a mass of 49.9amu has 2 electrons with principle quantum number n=1, 8 electrons with n=2, and 10 electrons with n=3. Provide nas many of the properties for the ion as possible from the information given.
when 24.4 ml of 0.500m sulphuric acid h2so4 is combined to 24.4ml of 1.00m potassium hydroxide koh in a coffee cup
what mass of glucose 180.0 gm must be added to 0.50 kg of water to increase the boiling point of the solution by 2.0
Luminol is a reagent used to detect blood at crime scenes. A technician prepares a stock solution by adding 6.0 g of luminol (molar mass=177 g/mol) to 50.0 mL of H2O.
A volume of 110.mL of H2O is initially at room temperature (22.0 °C). A chilled steel rod at 2.00 °C is placed in the water. If the final temperature of the system is 21.1 °C, Explain what is the mass of the steel bar
When 0.539 L of Ar at 1.20 atm and 227°C is mixed with 0.223 L of O2 at 501 torr and 127°C in a 400. mL flask at 27°C, what is the pressure in the flask
gaseous dinitrogen pentaoxide decomposes into oxygen and nitrogen dioxide. if we start with a partial pressure of 200
What is the pH of a solution obtained by adding 5.00 g of HI to 295 mL of a 0.786 M solution of nitric acid?
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