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Consider a perfect gas with Cvm = 28.0 J/mol-K trapped in a piston/cylinder arrangement with cross-section area of 250.0 cm^2. The gas expands irreversibly against a fixed external pressure of 1.0 atm adiabatically. Initially the gas is at 24.0 degrees C and at a pressure of 15.00 atm. The expansion causes the piston to travel 65.0 cm. Calculate q, w, delta U, delta T, and delta S for this process. Approach delta S calculation as a 2-step process.
A metal forms the fluoride MF2. Electrolysis of the molten fluoride by a current of 3.86 A for 16.2 minutes deposits 1.07 (backwards "g") of the metal.
A 125g metal block at a temperature of 93.2 degrees Celsius was immersed in 100g of water at 18.3 degrees celsius. Given the specific heat of metal (s= 0.900j/g x degrees celsius)
Calculate the concentration of ions in the following saturated solutions. (a) [I -] in AgI solution with [Ag+] = 9.6 multiplied by 10-9 M
The enthalpy change for the reaction below at 25oC is -1,850 kJ (per mole of C9H20). What is the internal energy change for the reaction at 25oC
A compressed air tank carried by scuba divers has a volume of 7.0 L and a pressure of 150 atm at 20C. What is the volume of air in the tank (in liters) at STP
Calculate the mole fraction of the salt in the solution
an irregular shape of metal has a mass of 54.6 grams and displaces 2.83 cm^3 of water when dropped into a graduated cylinder filled with water. What is the identity of the pure metal?
A gaseous oxide of nitrogen has an empirical formula of NO2. A 0.556 g sample of this gas in a 250. mL container at 24ºC exerts a pressure of 44.8 cm Hg. What is the molecular weight of the gas? What is the molecular formula of the gas
A solution of water (1.86) and glucose freezes at 3.95. What is the molal concentration of glucose in this solution? Assume that the freezing point of pure water is 0.00 .
Explain why emission spectrophtometry has the ability to be much more sensitive than absorbance spectroscopy
Assume a gasoline is isooctane, which has a density of 0.692 g/mL. What is the mass of 2.5 gal of the gasoline (1 gal = 3.78 L)? Answer in units of kg.
The following results were obtained for the determination of sulfur in a coal sample. The average for 4 trials was 1.94 %S with a standard deviation of 0.04 %S. Based on these data, report the 95% confidence limits for the average sulfur content.
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