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If the rate constant for a particulat reaction doubles between 273k and 283k , calculate the value of the activation energy for the reaction.
toothpaste contains 0.24% by mass sodium flouride used to prevent dental cavities. One tube contains 119g of toothpaste. How many moles of NaF are in the tube?
The wavelength of maximum absorbance is solvent dependent. in water, the wavelength of maximum absorbance is 453 nm.
if a sample of gas is at 2 atm and is at 15 degrees celsius, what would be the new pressure in the gas if the gas is heated to 100 degrees celcius?
A 44 sample of water absorbs 329 of heat If the water was initially at 21.7, what is its final temperature.
The outdoor concentration of radon is 1 pCi/L. Develop a mass balance for this problem and estimate the steady-state radon concentration in the crawl space (in pCi/L).
the hydrated radius of hemoglobin is found to be 3.55 nm. How many water molecules hydrate a hemoglobin molecule?
A solution is 0.05 M in Cr2O7^-2 and 0.003 M in Cr3-. If the pH is 4.0, What is value of the potential of the half reaction?
Determine the empirical formula of a hydrocarbon which has 92.24% C and 7.76% H. If 0.500 g of this hydrocarbon occupies 0.086 L at STP, determine the molecular weight of the compound.
You believe you have cracked a secret code that uses elemental symbols to spell words. The code uses numbers to designate the elemental symbols.
Say, for example, that you had prepared a Buffer, in which you mixed 8.203 g of sodium acetate, NaC2H3O2, with 100 ml of 1.O M acetic acid. What would be the initial pH of Buffer C.
In the combustion of propane for energy, how many kilojoules of heat are produced when 2 kilograms of propane are completely combusted in the presence of excess oxygen
Calculate the rate constant for the reaction when the reactant concentration in a first-order reaction is given 7.30×10-2M after 15.0s and it is also reported 4.40×10-3M after 65.0s . ?
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