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ID: 840925 • Letter: 1
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Two 20.0-g ice cubes at -10.0 degreeC are placed into 285 g of water at 25.0 degreeC. Assuming no energy is transferred to or from the surroundings, calculate the final temperature of the water after all the ice melts. Assuming 100% dissociation, calculate the freezing point and boiling point of 2.20 m Na2SO4(ag). Constants may be found here. For A rightarrow product, time and concentration data were collected and plotted as shown here. Determine the reaction order, the rate constant, and the units of the rate constant. Which of the following will be more soluble in an acidic solution than in pure water? A solution containing a mixture of metal cations was treated with dilute HCl and a precipitate formed. The solution was filtered and H2S was bubbled through the acidic solution. A precipitate again formed and was filtered off. Then, the pH was raised to about 8 and H2S was again bubbled through the solution. This time, no precipitate formed. Finally, the solution was treated with a sodium carbonate solution, which resulted in formation of a precipitate. Which metal ions were definitely present, which were definitely absent, and which may or may not have been present in the original mixture? For the following electrochemical cell Cu(s)|Cu2 + (aq, 0.0155 M)||Ag + (aq, 2.50 M)|Ag(s) write the net cell equation. Phases are optional. Do not include the concentrations. Calculate the following values at 25.0 degreeC using standard potentials as needed.Explanation / Answer
Answer 1 )two 20-g ice cubes = 40-g/18.0-g/mol = 2.22 mol; 285-g/18.0g/mol = 15.83 mol water; one additional point, the heat needed for a 1 K change in temp is the same as for a 1
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