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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?
A typical polyethylene bag from a grocery store weighs 12.4 g. How many molecules of ethylene, C2H4, must be polymerized to make such a bag
The vibrational frequency of the ICl molecule is 1.15 x 10^13 s^-1. For every million (1x10^6) molecules in the ground vibration state how many will be in the first excited vibrational state at temperature 300 K
How much heat energy, is needed to convert 64.0 grams of ice at -18.0 degrees celcius to H2O at the temperature of 25.0 degrees celcius? Express your answers in kilojoules
The freezing points of 0.0935 m ammonium chloride and 0.0378 m ammonium sulfate in water were found to be -0.322 C and 0.173 C. What are the values of the van't Hoff factors for these salts
What is the pH of a solution that results from adding 25 mL of 0.50 M NaOH to 75 mL of 0.50 M CH3CO2H. (Ka of CH3CO2H = 1.8 E 10-5
Draw the molecule by placing atoms on the grid and connecting them with bonds. Include all lone pairs of electrons. Show the formal charges of all atoms in the correct structure.
why is it important that none of the solid CaCl2 be included in the final distillation of 1-bromobutane?
The temperature in the room was 25.0 ºC. James was asked to transfer 4.50 mL of a liquid (density = 0.895 g/mL at 25.0 ºC) using a buret. He added the liquid into a 50-mL beaker weighing 25.789 g. He weighed the beaker with the liquid and found th..
A solution containing 10.mmol of CO3^-2 and 5.0 mmol. Of HCO3- is titrated with 1.0M HCL What total volume of HCL must be added to reach the second equivalence point?
A solution of ammonia and water contains 3.40×1025 water molecules and 7.20×1024 ammonia molecules. How many total hydrogen atoms are in this solution?
Write the schematic shorthand notation chemists use to represent electrochemical cells for a cell where the anode consists of solid copper immersed in a 0.0100-M solution of copper (II) nitrate and cathode consists of solid silver immersed
In photosynthesis, plants use energy from the sun in combination with carbon dioxide and water to form glucose (C6H12O6) and oxygen. If 4.50 moles of water react with carbon dioxide, what mass of glucose is produced?
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