12/19/23

Find the energy of a photon of light if the wavelength is 4.60x10^-7 m.
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12/16/23

How many chloramphenicol capsules, each containing 250 mg of chloramphenicol are needed to provide 50 mg/kg body weight per day for 1 week for a person weighing 150 lbs.
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12/14/23

Which sample contains the greatest number of atoms. A sample of P that contains 2.82×1024 atoms or a 5.64 mole sample of Si?
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12/12/23

Moles, Molar Mass, and Molarity│Please Help!
What is the molarity of a 0.500L solution that contains 2.0 moles of NaCl? 4.0M 250M 1.0M 2.0M
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12/12/23

Chemistry mol/L

A chemist prepares a solution of mercury(II) iodide HgI2 by measuring out 4.02mg of mercury(II) iodide into a 250. mL volumetric flask and filling the flask to the mark with water. Calculate the... more
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12/11/23

Chemistry Mol/L
What is the answer to this question? "A chemist prepares a solution of mercury(II) iodide HgI2 by measuring out 4.02mg of mercury(II) iodide into a 250. mL volumetric flask and filling the flask to... more
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12/06/23

Calculate the amount of americium-241 consumed in a smoke detector (initially containing 6.6000 µg of Am), in micrograms
Americium-241 is widely used in smoke detectors. Calculate the amount of americium-241 consumed in a smoke detector (initially containing 6.6000 µg of Am), in micrograms, that has been used for... more
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12/06/23

Le Chatelier's Principle│Please Help!
Indicate which conditions would keep the soda fizzy (more H2CO3) by selecting the correct change in the stressor from the drop down menu.Pressure: Increase / DecreaseVolume: Increase /... more
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12/06/23

Molar Enthalpy of Fusion

At standard conditions (1 bar), the melting point of ethanol is at -114.1 C. When a pressure of 3700 bar is applied to solid ethanol, its melting temperature rises to -92.2 C. Determine the molar... more
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12/06/23

Calculate equilibrium constant at 25C And 45C
I’m given the equilibrium concentration of of chemical reaction at 25C [SO2]= 0.1 M, [O2] = 0.3 M and [SO3] = 0.5 M2 SO2 (g) + O2 (g) <——> 2 SO3 (g). I’m asking to find the equilibrium... more
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12/06/23

How much energy (in kJ) is absorbed/released to cool the gas?
A 130.2 gram sample of an unknown substance (MM = 189.50 g/mol) is cooled from 233.0 °C to 147.6 °C. (heat capacity of liquid = 1.62 J/g･ °C; heat capacity of gas = 1.04 J/g･ °C; ∆Hvap = 78.11... more
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12/05/23

What are the basic assumptions of the kinetic-molecular theory?
Check all that apply.Gas pressure is a measure of the number and forcefulness of collisions between gas particles and the walls of their container.The average kinetic energy of the gas particles is... more
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12/05/23

25. Consider the following reaction. 2N*O_{2}(g) = N_2O_4(g)
Consider the following reaction.2N*O_{2}(g) = N_2O_4(g)When the system is at equilibrium, it contains NO_{2} at a pressure of 0.810 atm, and N_{2}O_{4} at a pressure of 0.0656 atm. The volume of... more
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12/04/23

Balance this nuclear reaction by supplying the missing nucleus. Replace each question mark with an appropriate integer symbol.
Balance this nuclear reaction by supplying the missing nucleus. Replace each question mark with an appropriate integer symbol.24998Cf+ :??? ---->260105Db+410n
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12/04/23

How many neutrons are needed to initiate the fission reaction?
How many neutrons are needed to initiate the fission reaction?23592 U+?10n--->13752Te +9740Zr+210nnumber of neutrons:?
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12/04/23

calculate the number of days it will take for the mass to be reduced to 3.00μg.
The half-life of radioactive chromium-51 is 28 days. If a sample of chromium -51 has a mass of 12.0 μg, calculate the number of days it will take for the mass to be reduced to 3.00μg.time: ?days
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12/04/23

can you solve this using the C1V1= C2V2 equation
the volume of the water is 125 ul and the volume and the source of protein is 375 stock and the final volume is 500 uL what is the final protein concentration?
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12/04/23

Definition of acidic solution
Which of the following is a correct definition of an acidic aqueous solution?I. A solution where [H+]>[OH]- II. A solution with pH<7A. I, onlyB. Both I and IIC. II, onlyD. Neither I nor II
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12/04/23

pH of neutral solution
What is the pH of pure water at body temperature of 37 degree Celsius? Kw of water at that temperature is 2.4x10-14
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12/04/23

question in the description. I know that partial pressure of NO=O
Two bulbs are connected by a stopcock. The large bulb, with a volume of 6.00 L, contains nitric oxide at a pressure of 0.650 atm, and the small bulb, with a volume of 1.50 L, contains oxygen at a... more
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12/04/23

I need help on these chemistry problems. Cant seem to figure out the solubilities.
A solution of CuSO4 was prepared and added to a well on a 24-well plastic plate. A piece of metal was placed into the solution. The CuSO4 solution did not react with the piece of metal that was... more
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12/03/23

The vapor pressure of pure benzene is 96.0 torr. The vapor pressure of pure toluene is 27.0 torr
A.) Calculate the vapor pressure of benzene, C6H6, at 25 degrees Celsius in an ideal solution containing 1.68 mol of toluene. B.) Calculate the vapor pressure of toluene,C7H8, at 25 degrees Celsius... more
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12/03/23

If the initial concentration of A is 0.407 M, and the rate constant for this reaction is 0.0341 M s^-1 at 400, What is the half-life of this reaction?
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12/03/23

What percentage of the molecules are at or above the activation energy at 500.0 K?

The activation energy for a particular reaction is Ea=16.00kj
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12/03/23

Reaction: O3(g) +NO(g) = O2(g)+NO2 has at 310K the rate law

Rate of reaction =k[O3][NO] k= 3.0x10^6Given that [O3]= 5.0x10^-4M and [NO]=6.0x10^-5M at t=0calculate that rate of the reaction at t=0
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