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Only trace amounts of the synthetic element darmstadtium (atomic number 110) have been obtained. The element is so highly unstable that no observations of its properties have been possible. Based on its position in the periodic table, propose two different reasonable valence electron configurations for this element.
Find the theoretical, percent yield and percent error of the reaction - Calculate the percent error of this reaction.
Calculate the pH of 1.00 L of a buffer that is 0.140 M HNO2 and 0.180 M NaNO2. What is the pH of the same buffer after the addition of 1.00 mL of 12.0 M. HCl. (pKa of HNO2 = 3.40). What is the pH of the Original buffer and after HCl is added?
Consider a distillation column that is fed 1000 kg/hr of an equimolar mixture of benzene and cyclohexane. Theof the benzene distillate stream is to contain 90 % with a benzene mole fraction of 0.95.
Calculate (a) the mole fraction of the solute, (b) the number of moles of solute in the solution, and (c) the molecular mass of the solute.
Which formula is a correct representation of pentane? What is the organic product of the reaction between ethanol and ethanoic acid? Explain why the incomplete combustion of hydrocarbons is harmful to humans.
An unknown compound burned with a yellow, nonsmoky flame and was found to be insoluble in 5% sodium hydroxide solution but soluble in concentrated sulfuric acid.
Use the Variational Principle a to estimate the ground state energy of a harmonic oscillator with un-normalized trial wavefunction φ(x)=1/(1+βx2)2 where β is a paramete
The combustion of one mole of ethanol (C2H5OH(l)) to produce carbon dioxide and gaseous water has ?Hr = -1235 kJ · mol-1 at 298 K. What is the change in internal energy for this reaction?
If you have 1 gram of (-) ethyl lactate and purify it with an enantiomeric excess of 85% yields, wihout any loss of material. How many grams of the (+) enantiomer were separated?
At equilibrium the concentration of NO in the vessel is 0.161M. At equilibrium the vessel contains N2, H2O and H2. What is the value of the equilibrium constant Kc for the following reactions?
The observations listed were made on different solns. Given the observations state which ion studied in this experiment is present. If the test is not definitive, indicate that with a (?).
What is the equilibrium concentration of fluorine if the initial concentrations of bromine and fluorine were 0.111 moles/liter in a sealed container and no product was present initially?
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