test/practice tes PERCENT WATER IN A HYDRATE PRELAB QUESTIONS NAME The following data were obtained when a hydrate was heated: crucible + sample 31.781 g empty crucible 30.501 g crucible + sample after heating 31.100 g Calculate the % water in the hydrate. SHOW WORK 1. Decide whether the sample was BaCl2 2H2O or MgCl2 6H20 by calculating the theoretical % water in each compound and comparing to your answer in #1. SHOW WORK. 2. 95.218 g/mole 1 MgCl2 Formula weights: 208.25 g/mole 1 ВаClz 18.0153 g/mole 11 Н.О 89

test/practice tes PERCENT WATER IN A HYDRATE PRELAB QUESTIONS NAME The following data were obtained when a hydrate was heated: crucible + sample 31.781 g empty crucible 30.501 g crucible + sample after heating 31.100 g Calculate the % water in the hydrate. SHOW WORK 1. Decide whether the sample was BaCl2 2H2O or MgCl2 6H20 by calculating the theoretical % water in each compound and comparing to your answer in #1. SHOW WORK. 2. 95.218 g/mole 1 MgCl2 Formula weights: 208.25 g/mole 1 ВаClz 18.0153 g/mole 11 Н.О 89

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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what should i write for the final answer with the right number of sig figs?
14-15
Convert -40. kcal/mol to kJ/mol using the fact that 1kcal = 4.184 kJ. Show work using dimensional analysis. 1 kcal 4.184 kJ kcal kJ = -9.6 mol O a. -40. mol O b. -40, kcal v 4.184 kJ kJ = -170- mol mol 1 kcal Once we know the value of AHrxn it is possible to solve many other types of problems. For example, how many moles of zinc should we react with 6HCI to generate 120 kJ of heat? a. 120 kJ 1 mol = 0.71 mol -170 kJ O b. 120 kJ -170 kJ 1 mol 20,000 mol %3D How many grams of zinc react with excess 6M HCI if 500. kJ of heat are released? Use dimensional analysis, the AHxn and the atomic mass of zinc. O a. 500. kJ 1 mol 65.39 g 190 g Zn %D -170 kJ 1 mol
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100 - 15 = 85 not 75