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Consider a reversible heat engine operating between two reservoirs, R1 and R2, initially at temperatures TH and TC, respectively, where TH > TC. Assume that the cold reservoir, R2, has an infinite heat capacity (i.e. TC = constant) but that the hot reservoir, R1, is finite with a constant heat capacity C1. Accordingly the temperature of R1 decreases with time from its initial value of TH. In each cycle, the heat engine absorbs an infinitesimal amount of heat dq from R1, converts part of it into work dw, and rejects the remaining heat into R2. The engine stops working when the temperature of the hot reservoir has been lowered to TC. Show that the amount of work done by the engine is W = C1(TH-TC) - C1TC ln (TH/TC).
The second virial coefficient of methane can be approximated by the empirical equation , where a = -0.1993 bar-1, b = 0.2002 bar-1, and c = 1131 K2 with 300 K
Th-232 has a half-life of 1.39 x 10^10 years old. A certain rock has a Pb-208/Th-232 mass ratio of 0.25/1.00. Estimate the age of the rock.
What monosaccharide is the C-2 epimer of alpha-D-galactose? Are these two molecules diastereomers?
a gas is confined to a cylinder under constant atmospheric pressure. when 415 j of heat is added to the gas it expands
What is the function of a chemical indicator. (is the answer the function is to determine if a sample solution is a base or an acid?) Why is water considered neutral
What is the molarity of a solution of HCl if 2.0 L of it are needed to react with 20g of NaOH?
At 125°C, Kp = 0.25 for the following reaction. 2 NaHCO3(s) Na2CO3(s) + CO2(g) + H2O(g) A 1.00 L flask containing 14.8 g NaHCO3 is evacuated and heated to 125°C.
Calculate the standard change in Gibbs free energy for the following reaction at 25 °C. 2C2H6 (g) + 7O2 (g) -> 4CO2 (g) + 6 H2O (g) ? kJ
Ultra-high-vacuum experiments are routinely performed at a total pressure of 1.0x10^-10 torr. Calculate the mean free path of N2 molecules at 350K
Then use the estimate to calculate the heat of formation of ethanol from the heats of formation (in KJ/mol) of CO2: -?394, and H2O: -?242.
Combustion of solid urea: CO(NH2)2 (s) + 3/2 O2 (g) --> CO2 (g) + N2 (g) + 2H2O According to bomb calorimetry measurements
What happens to these physical properties as the strength of intermolecular forces (London dispersion forces, Dipole-dipole forces, Ion-dipole forces, Hydrogen-bond forces) increases
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