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Suggest why Po-210 and At-211 are the isotopes of those elements with the longest half-lives.
How many moles of bromine trifluoride are needed to react completely with 9.68 moles of titanium (IV) oxide?
Calculate the pH value of solution (a) after 10.0 mL of NH3 solution have been added and (b) after 25.0 mL solution have been added (Ka for NH4+ = 5.6 x 10^(-10).)
1.0678g of a standard iron(ii) ammonium sulfate, (NH4)2Fe(SO4)2. 6H202 requires 35.50mL of permanganate solution for titration. calculate the molary of the permanganate solution.
Compute the amount of heat evolved in the oxidation of 32.0 grams of Fe at the temperature 25 oC and pressure 1 atm pressure ( ΔHfo(Fe 2 O 3 ,s) = -824kJ/mol)
Draw the product formed when Reaction of [(1R)-1-methoxypropyl]benzene undergoes substitution with the hydroxide ion
Reaction 1 uses 0.260 of reactant, and Reaction 2 uses 0.590 of reactant. How many times faster is Reaction 2 compared to Reaction 1.
A 0.264-gram sample of an amino acid was dissolved in 95.0mL of water and titrated with 0.105M NaOH. The first equivalence point was found at V(OH)=16.3mL.
When no single electronic formula can be drawn for a stable molecule so as to maintain the octet rule and still fit the observed properties
Determine the functional form of Phi(t) and the frequency of a pendulum bob whose mass is m and is attached to a massess rod of length l. Assume that the bob oscillates in the limit of small oscillations.
Starting from 1-methylcyclopentene and using other reagents and number of steps that you need, synthesize the following compounds.
The standard enthalpies of formation of SO3(g), S(g) and O(g) are -359.7, +278.8 and +249.0 kJ mol-1, respectively. Use these data to calculate the average bond energy (in kJ mol-1) of the S=O double bond.
A 782 mL gas sample at STP is compressed to a volume of 131 mL, and the temperature is increased to 22?C. What is the new pressure of the gas in Pa?Answer in units of Pa.
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