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A certain diatomic molecule vibrates with a characteristic frequency v= 2.45x10^9s^-1 (these are microwaves). Calculate the relative population of the ground state and first excited state at 1K.
If the concentration of RNA in a solution is 0.01mg/mL, calculate its absorbance at 260nm. Assume a path length of 1 cm and each base to have an average molecular weight of 330.
In water, without the enzyme, the reaction proceeds with a rate constant of 0.039s^-1 at 26C. In the presence of the enzyme in water, the reaction proceeds with a rate constant of 1.0 x 10^6 s^-1 at
Calculate the energy associated with each of the three wavefunctions of lowest energy, in order of increasing energy. Provide an expression for the average distance from the nuclues for the 2s and 2p
A mixture of He,Ar, Xe and has a total pressure of 2.60 atm. The partial pressure of He is 0.350 atm, and the partial pressure of Ar is 0.200 atm. What is the partial pressure of Xe?
In standardizing a solution, what would happen if instead of putting HCl solution into a buret and standardized NaOH solution into a beaker when performing a titration?
What Celsius temperature,T2 , is required to change the volume of the gas sample in Part A ( T1= 35 degrees celsius, V1= 1120 L) to a volume of 2240 L?
A 10.0 L gas cylinder has been filled with 7.40 moles of gas. You measure the pressure to be 3.90 atm. What is the temperature inside the tank?
A balloon is floating around outside your window. The temperature outside is 15 degrees celsius, and the air pressure is 0.700 atm. Your neighbor, who released the balloon, tells you that he filled
Imagine that you have an ideal gas in a 8.90 L container, and that 1550 molecules of this gas collide with a square-inch area of the container at any given instant.
Using the same sample of gas ( P1= 405 torr, T1 = 1 degree celsius), we wish to change the pressure to 4050 torr with no accompanying change in volume or amount of gas.
A sample of ideal gas is in a sealed container. The pressure of the gas is 405 torr, and the temperature is 1 degree celsius.
A sample of gas in a cylinder as in the example in Part A has an initial volume of 40.0 L, and you have determined that it contains 1.50 moles of gas. The next day you notice that some of the gas ha
A cylinder, with a piston pressing down with a constant pressure, is filled with 2.20 moles of a gas (n1), and its volume is 41.0 L (v1).
Determine the concentration of hemoglobin solution knowing that its absorbance is 0.65. The pathlength is 1 cm and the extinction coefficient is 3.9 x 105 M-1cm-1.
When titrating a standardized solution such as NaOH, why is it important to perform each titration multiple times (think about why it's important to continue titration past the equivalence point.
The recommended daily dietary intake of calcium for adult men and pre-menopausal women is 1100 mg/day Calcium citrate , Ca3(C6H5O7)2 What mass of calcium citrate would be needed to provide the recom
How many atoms of iron would be needed to react completely with 36 molecules of oxygen? How many molecules of oxygen would be needed to react completely 16 atoms of iron?
A student has a solution containing a mixture of metal cations: Cu+2, Cr+2, and Fe+3, each a solution with NO3- anion. Adding a concentrated solution of NH4OH(aq) caused the precipitation of Cr+2 an
What is the magnitude of the average acceleration of a skier who, starting from rest, reaches a speed of 11.8 m/s when going down a slope for 3.61 s?
Torsional strain is exhibited during exclipsed Newman Projections. Where would steric hindrance be demonstrated? At any point in a Newman Projection?
A 28.0g sample of an unknown metal at 99.0c was placed in a constant pressure calorimeter containing 85.0g of water at 24.0c. the final temperature of the system was found to be 28.4c.
The first-order isomerization reaction: cyclopropane ? propene, has a rate constant of 1.10 × 10-4s-1 at 470°C and 5.70 × 10-4s-1 at 500°C. What is the activation energy, Ea, for
An aqueous solution containing 9.03 g of an optically pure compound was diluted to 200.0 mL with water and placed in a polarimeter tube 20.0 cm long. The measured rotation was -2.85° at 25 °
Determine the delta G associated with the dissociation of 5.0g of C76H52O46 at room temperature in 50mL of pH=7.55 buffered solution that has already had 2.5g C76H52O46 dissolved into it.