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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).
How many grams of water can be cooled from 54.7 ? to 43.1? by the evaporation of 19.7 g of water? The heat of vaporization of water in this temperature range is 2.40 kJ/g
1 the reaction of aluminum and potassium hydroxide isgiven below als koh 3h2o -----gtkaq aloh4 - 32 h2g a how many
From a consideration of the Lewis structure of the thiocyanate ion, in which carbon has a double bond with both the sulfur and nitrogen atoms, what are the formal charges on the sulfur, carbon, and nitrogen atoms are, respectively
42 kg of graphite is added to 1 metric ton of iron and the mixture is heated to 1300 then slowly cooled to room temperature. Calculate the mass of each microstructure and the mass and composition of each phase within each microstructure at the fol..
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What will be the likely effect of clearing forests and converting them to grasslands and crops on (a) the earth's reflectivity (albedo) and (b) the earth's average surface temperature?
The density of 70.5 weight% aqueous perchloric acid is 1.67 g/ml. Recall that grams refers to grams of solution (=g HClO4+g H2O). How many grams of HCIO4 are in 1 Liter
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The reaction of 6.68 of carbon with excess O2 yields 13.05 g of CO2. Explain what is the percent yield of the reaction
If I put a methanol solution of m-THPC into a 10.0 mm pathlength cuvet, and observe an absorbance of 0.132 (no units) at 652 nm, what is the concentration of the solution? (Assume there are no other solutes present in the methanlo.
What is the molar composition of the vapor in equilibrium with a boling liquid that has a composition of 60% A and 40% B
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