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1. Answer the following questions: a) can Al3+(aq) oxidize tin (Sn) under standard-state conditions?; b) would it be OK to store an aqueous AlCl3 solution in a tin container?; c) can Sn2+(aq) oxidize aluminum (Al) under standard state conditions?; d) would it be OK to store an aquous SnCl2 solution in an aluminum container?
A. a) yes; b) yes; c) no; d) noB. a) no; b) no; c) yes; d) yesC. a) yes; b) no; c) no; d) yesD. a) no; b) yes; c) yes; d) no
2. The exothermic reaction NH3(g) + HCl(g) ? NH4Cl(s) proceeds spontaneously at 25°C even though there is a decrease in disorder in the system (gases producing a solid). Why?
A. the exothermic reaction increases the temperature from 25°C to a higher temperature which increases the T?S componentB. there is a phase change from gases to solid which means ?G is zero which, when combined with a negative ?H, results in a spontaneous processC. the decrease in entropy of the system is offset by an increase in the entropy of the surroundings caused by the absorption of heat by the system from the surroundingsD. the decrease in entropy of the system is offset by an increase in the entropy of the surroundings caused by the release of heat from the system to the surroundings
3. The equilibrium reaction CaCO3(s) ? CaO(s) + CO2(g) reaches ?G° = 0 at 835°C. At this temperature:
A. ?H° = ?S°B. the percent yield of CaO reaches 100%C. the reaction becomes exothermicD. the pressure of CO2 is 1 atmE. the decomposition of CaCO3 begins
A solution is prepared by adding 1.10 g of solid rm NaCl to 50.0 mL of 0.100 M {CaCl_2}. What is the molarity of chloride ion in the final solution? Assume that the volume of the final solution is 50.0 mL.
A 135 mL sample of a 15.0 M ethylene glycol (rm C_2H_6O_2) solution is diluted to 1.50 L.What is the freezing point of the final solution.
Important information about Quant problems, Calculate pFe2+ at Ve in the titration of 25.00 mL of 0.02026 M EDTA by 0.03855 M Fe2+ at pH
The average water loss during a triathlon is 1.40 L in one hour. The average time to finish a triathlon is 12.6 hours. How much sweat is lost in m^3?
Explain why the Rf values changed when the eluant was changed from 100% petroleum ether to a 95:5 mixture of petroleum ether-ethyl acetate.
How many atoms of neon occupy a volume of 14.3 L at STP?
An industrial chemist 2.00 moles each of h2 and co2 in a 2.00 L container at constant temperature of 800 degree celcuis. this reaction occurs:
Compute the volume of the tank if this tank has 115 moles of neon gas and has a pressure of 57 atm at a temperature of 45 0C.
What is the value of Kc for the decomposi- tion of ammonium carbamate into ammonia and carbon dioxide?
Consider the following equilibrium process at 686°C: CO2(g) + H2(g) ? CO(g) + H2O(g) The equilibrium concentrations of the reacting species.
At what temperature will 6.21 g of oxygen gas exert a pressure of 5.00 atm in a 10.0-L container
If 352 g of magnesium reacts with excess oxygen to produce 296 g of magnesium oxide, what is the percent yield for the reaction?
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