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Determine the thickness needed to reduce the intensity of a beam of gamma rays to 1/4th of its initial intensity (in g/cm^2, in cm) for a 300 keV gamma ray in Al, and in Pb.
Density of Al= 2700 mg/cm^3Density of Pb= 11300 mg/cm^3
Find the standard enthalpy of formation of ethylene, C2H4(g), given: heat of combustion = -1411 kJ/mol, Hf [CO2]= -393.5kJ/mol, Hf [H2O]= -285.5kJ/mol
To heat 236mL of water from 25 degrees celcius to 78 degrees celcius in 2.00 minutes what must be the heat rating of the heater, in kJ/min
Oxygen gas reacts with powdered aluminum according to the following reaction: 4Al(s) + 3O2 (g) = 2Al2O3(s). How many liters of O2 gas, measured at 779 mm Hg and 30 C, are required to completely react with 2.5 mol of Al?
The poison strychnine is a weakly basic compound with Kb = 1.8e-6. What is the pH of a 0.058M solution of strychnine
To a solution that is known to contain come of the soluble ions from group 1 and no other cations or inteferring substances, 12 drops of 6M hydrochloric acid is added and no precipoiate forms.To clear solution is evaporated to half its volume and ..
methyl alcohol (CH3OH) is made by reacting carbon dioxide with H2. Starting with 2.5g of H2 and 30.0 L of Co, what mass of methyl alcohol could be produced at STP.
For the elementary processes whose equations are given below, determine whether each is unimolecular or bimolecular and determine the rate law for each process. Pick the choice which is correct.
The sum of the third and the fourth terms is 48. If the terms of the geometric progression are alternately positive and negative, then the first term is?
The crossed aldol condensation of acetaldehyde with benzaldehyde is aided by the fact that benzaldehyde bears no α-protons. However, a possible competitive reaction is the “selfcondensation†of two molecules of acetaldehyde.
Can anyone help me with the reaction sequence AND stepwise mechanism for the mono-nitration of phenyl methyl ketone
Referring to Table 17.1, calculate the mole fraction of Xe and its concentration in parts per million by volume.
A gaseous mixture of O2 and N2 contains 37.8% nitrogen by mass. what is the partial pressure of oxygen in the mixture if the total pressure is 325 mmHg
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