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Experimental measurements of heat capacities are often represented in reference works as empirical formulas. For graphite, a formula that works well over a fairly wide range of temperatures is (for one mole)
Cp = a +bT - c/T2
where a= 16.86 J/K, b= 4.77 x 10-3 J/K2, and c= 8.54 x 105 J·K. Suppose, then, that a mole of graphite is heated at constant pressure from 298 K to 500 K. Calculate the increase in its entropy during this process. Add on the tabulated value of 8(298 K) (from the back of this book) to obtain 8(500 K).
Eggshells contain calcium carbonate CaCO3. What test would determine the presence of carbonate in these substances and how would u write the chemical equation for this reaction
How does the Zeff for potassium compare with the Zeff for argon?
Conservatively, volumes of all glassware are expressed at 20 degrees C. The expansion coefficient of glass is 0.0025% per degree Celsius. If a flask if sound by calibration to contain 200.09 ml at 20 degrees C, explain what is the volume of the fl..
(a) Given that the molar mass of H2SO4 is 98.1 grams, determine the number of grams of H2SO4 needed to prepare 0.2 L of a 0.5 M H2SO4 solution. Show your work.
Assuming that the density of bleach is the same as water, calculate the volume of household bleach that should be diluted with water to make 500.0 mL of a pH = 9.80 solution.
What total volume of ozone measured at a pressure of 21.0 {\rm mmHg} and a temperature of 227 {\rm K} can be destroyed when all of the chlorine from 12.0 {\rm g} of {\rm{CF}}_3 {\rm{Cl}} goes through ten cycles of the above reactions
Rate constants for the decomposition of acetaldehyde were measured at five different temperatures. A plot of ln k versus 1/t gave a slope of -2.09*10^4 K. What is the activation Energy for this reaction
What mass of sodium chloride, NaCl, is needed to make 389. g of a 3.89%(m/m) NaCl solution? (atomic masses: Na = 22.99, Cl = 35.45)
what mass of water would need to evaporate from your skin in order to dissipate 1.7 times 105 j of heat from your body?
A voltaic cell is constructed by immersing a strip of silver in a 1.0M AgNO3 solution and a strip of cadmiun metal in a 1.0M Cd(NO3)2 solution. The circuit is completed by a wire and a salt bridge in the usual way. Write the balanced overall cell ..
a 150.0 g sample of metal at 80 c is added to 150.0g of H2O at 20 c. the temperature rises to 23.3 c. assuming that the calorimeter is a perfect insulator, what is the specific heat of the metal?
Does the carbocation intermediate in the hydrolysis of 2-bromo-3-methylbutane rearrange by way of a hydride shift, methyl shift, or neither
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