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Solid CO2 (dry ice) sublimes with ΔHsubl = 25.2 kJ/mol at 195 K. A block of dry ice whose mass is 24.4 g sublimes in a room whose temperature is 26.5 oC.
a) What is the entropy change (ΔS) of the CO2?
The piston is then moved in and the heat rejected by the air reversibly at constant pressure until the volume is= initial volume. compute The net heat flow and the overall change in entropy?
At 30 degrees Celsius, the titration of a 5.0 mL sample of succinic acid required 29.56 ml of .950M NaOH. Find the concentration of succinic acid in moles/liter
which of the following compounds is expected to have the strongest ionic bonds. a) RbF b) NaF c) NaI d) CsBr e) CsI
The isotope, Cesium 137, has a half life of 30 years. Cesium-137 is a produced in nuclear power plants. We currently find high levels of Cs-137 in the area surrounding the highly radioactive reactor in Japan.
The bromocresolgreen end point of the titration was reached after the addition of 30.00mL of hydrochloric acid solution. Calculate the concentration of the acid solution
if you had a saturated solution of nano3 at 40 degrees celsius that contained 85 grams of water how much of the salt
When a 3.00-g sample of KCl is dissolved in water in a calorimeter that has a total heat capacity of 2.472 kJ·K-1, the temperature decreases by 0.280 K. Calculate the molar heat of solution of KCl in kJ/mol
Why is the reaction of the dissolving ammonium nitrate (NH4NO3) in water spontaneous even though the dissolution is endothermic
97.5g sodium chloride were dissolved in distilled water in 500ml volumeristic flask. the mixture was stirred to form a
The following data were obtained for the determination of iron in serum by a spectrophotometeic method. Assuming the validity of Beer's Law for the experiment calcualte the concentration of iron in serum
Calculate the pH of the resulting solution if 22.0 mL of 0.220 M HCl(aq) is added to (a) 32.0 mL of 0.220 M NaOH(aq). (b) 12.0 mL of 0.320 M NaOH(aq).
What is the (a) molality, (b) freezing point, (c) boiling point of a solution containing 100.0 g of ethylene glycol (C6H6O2) in 150.0 g of water
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