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ID: 919581 • Letter: H
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help please Show details of your work including the correct number of significant figures and the proper unit. One line answers will be given a ZERO grade even if the answer is the correct one. A piece of the copper metal weighing 250.0 g was heated to 500 'C in a furnace. If this hot copper piece was dropped in 1.00 kg of water (about a quart) at 20.0 'C, what would be the final temperature? The specific heats of copper metal and water are 0.385 J/g "C and 4.18 J/g 'C, respectively. In a first-order reaction, X rightarrow products, the initial concentration of X is 0.400 M and its concentration drops to 0.250 M after 15.0 min. Calculate the half-life of the reaction. (Caution: the concentration of X has changed signficantly.)For the reaction, HO(g) OH;(g) + H2O(g) OH(g), a plot of ln(K) vs. 1/T gives a straight line with slope of -7.2 Times 10J K. What is the activation energy for this reaction? In a saturated solution of magnesium fluoride, 0.0010 mole of MgF2 dissolved in 500 ml of water. Calculate for MgF. What is JG at 1000 'C for the following reaction? (Use data from Appendix C) CaCOt(s) ^ CaO(s) rightarrowCO,(g) Is this reaction spontaneous at 1000 'C and 1 aim. What is the value of Kf2, at 1000 'C for this reaction? What is the partial pressure of CO2? A solution contains 0.10 M each of Ag'(aq)and 0.1M Pb ' (aq). Sol'd NaCl is added, i.e. (Cl) increases, slowly without changing the total volume. Gwen KAgCI) = 1.6 x 10 and Kf2(PbCI2) = 2.4 Times 10 4, when Pbd, starts to precipitate: What is the (Cl) that remains in the solutions? Based on your answer to A, what concentration of Ag+ will remain in solution?Explanation / Answer
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