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A wood sample is obtained from a tree that originally grew in 1804 A.D. If the initial rate of decay in 1804 A.D. can be assumed to be 13.56 decays per minute, how many 14C disintegrations have occurred in the sample since that time? The half-life of 14C is 5,730 years.
The equilibrium constant kp for the following reaction is found to be 4.31 *10^-4 at 375 degrees C. N2(g)+3H2(g) 2NH3(g) Calculate the partial pressures of all species when equilibrium is reached.
Freon-12, CF2Cl2, is a refrigerant and aerosol propellant suspected of accelerating the loss of ozone in the upper atmosphere. It is prepared by reacting gaseous carbon tetrachloride
What volume of O2 at 798 mm Hg and 39 degrees celsius is required to synthesize 19.0 mol of NO
Using the de Broglie wave equation, calculate the speed, in m/s, at which an electron must travel to have a wavelength of 25.0 pm?
Write the net ionic equations that account for the pH values of: 0.1M NH4Cl (pH 6.25), 0.1M NaC2H3O2 (pH 8.24)
For the reaction NO2(g) + CO(g) => NO(g) + CO2(g) at temperatures below 500 K, the rate law is rate = k [NO2]2. Which mechanism is consistent with this information. Mechanism 1 NO2 + NO2 => NO3 + NO slow CO + NO3 => CO2 + NO2 fast Mechanism 2 NO2 ..
Rubidium has two naturally occurring isotopes with the following masses and natural abundances, Calculate the atomic weight of rubidium.
What is the identity of the metal if 0.280 grams of the metal is plated out in the electrolysis? Show all calculations.
Express the concentration of 3 % H2O2 solution as molality and in a mole fraction. Explain the meaning of the mole fraction.
Ionization involves completely removing an electron from an atom. What wavelength of light contains enough energy in a single photon to ionize a hydrogen atom
silver (I) perchlorate into a 50.ml volumetric flask and filling the flask to the mark with water. calculate the concentration in mol/L of the silver (I) perchlorate soluation
Determine the molarity of a solution of twenty grams of Ammonium bromide, NH4Br, in enough water to produce 132 mL of solution?
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