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Polonium - 210 has a half life of 138.4 days, decaying by alpha emission. Suppose the helium gas originating from the alpha panicles in this decay were collected. What volume of helium at 25°C and 735 mmHg could be obtained from 1.0000g of polonium dioxide, PoO2, in a period of 48.0 h?
A reaction has a standard free energy change of -12.8 kJ mol^-1 (-3.059 kcal mol^-1). Calculate the equilibrium constant for the reaction at 25 degrees celcius.
A mass of mercury occupies 0.750 L. What volume would an equal mass of ethanol occupy? The density of mercury is 13.546 g/mL and the density of ethanol is 0.789 g/mL.
A solution of 350mg of optically active 2-butanol in 10 mL of water, placed in a 20 cm cell shows an optical rotation of +6 .24 o. What is the specific rotation of this compound
Careful spectral analysis shows that the yellow light of the sodium lamp is made up of photons of two wavelengths, 589.0 nm and 589.6 nm. What is the difference in energy (in joules) between photons with these wavelengths?
If a student finds the molecular weight of an unknown liquid to be 145 g/mole and the molecular formula of the liquid is CHCL3, what is the percent error in the molecular weight
What are the equilibrium partial pressures of CO and CO2 if CO is the only gas present initially, at a partial pressure of 0.988 atm?
Determine the empirical formula of the amino acid, given an amino acid which consists of the elements carbon, hydrogen, nitrogen, and oxygen.
Now suppose you have only added 24.0mL of 0.01M NaOH solution to the 25.0mL of HCl solution, what is the molarity of HCl left in the solution? What is the pH of the resultant mixture?
Explain which of the following aqueous solutions has the strongest ion-dipole attractions:0.3 M Na3PO4, 0.1 M NiF2,0.2 M Rb2CO3, 0.01 M Sr(OH)2 , 0.03 M ScBr3.
Why must the spot applied to a TLC plate be above the level of the developing solvent
What is the dew point temperature of a gas mixture that is 30% n-hexane, 30% in-heptane, and 40% air at 1 atm? What is the composition of the first "drop"?
The following question is offered in anticipation of our chapters on metabolism: Assuming that the average weight of an adult is 160 lbs, how many molecules arrive each second at a mitochondrion of an average active person
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