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Iodine-123 is used to establish thyroid gland function. If after 79.8 hours, 1.56% of the original dose remains in the patitent, what is the half-life?
A certain first-order reaction (products) has a rate constant of 6.90×10-3 s^{-1} at 45 C. How many minutes does it take for the concentration of the reactant, [A], to drop to 6.25% of the original concentration?
Consider the case of 10 oscillators and eight quanta of energy. Determine the dominant configuration of energy for this system by identifying energy configurations and calculating the corresponding weights. What is the probability of observing the..
Nitrosyl bromide, NOBr, is 34 percent dissociated at 25 deg. C and the total pressure is 0.25 atm.
What is the ratio of enantiomers of 2-octanol in the product mixture? 55% (S) and 45% (R). However, I am not sure how to draw the structure of the major enantiomer produced in this reaction. Indicate the configuration of the stereogenic center usi..
The water level in a graduated cylinder initially at 221 rises to 271 after a piece of lead is submerged. What is the mass in grams of the lead?
Nitromethane CH3NO2) burns in air to produce significant amounts of heat. 2 CH3NO2(l) + 3/2 O2(g) --> 2 CO2(g) + 3 H2O(l) + N2(g). delta H^0 reaction = -1418 kJ
A 0.54 M solution of a compound in water has a density of 1.340 g/mL at 20°C. What is the molality of this solution. Assume that the mass of the solution is the mass of the solvent
Assuming the solution has a heat capacity of 4.18 J/°C·g and assuming no heat loss to the calorimeter, calculate the enthalpy change for the dissolution of NH4NO3 in units of kJ/mol. Please provide answer in kJ/mol
What observed rotation is expected when a 1.02 M solution of (R)-2-butanol is mixed with an equal volume of a 0.510 M solution of racemic 2-butanol
Calculate the solubility-product constant for PbF2. Ksp = (c) The Ksp of ZnSe at 25 oC is 3.60e-26. What is the molar solubility of ZnSe? solubility = mol/L
One of the side effects of taking non-steroidal anti-inflammatories like aspirin and ibuprofen is a degradation of the integrity of the stomach lining.
Calculating concentration in equilibrium, At pH 6.00 and pE 2.60, what is the concentration of Fe2+ (mol/L) in equilibrium with Fe(OH)3?
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