Exercise 1

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Stoichiometry7. Magnesium is obtained from sea water. Ca(oh) 2 is added to sea waterto precipitate Mg(OH) 2 . The precipitate is filtered and reacted withHCl to produce MgCl 2 . the MgCl 2 . If 185.0 g of magnesium arerecovered from 1000.0 g of MgCl 2 , what is the percent yield for thisreaction?8. Aluminum hydroxide is often present in antacids to neutralizestomach acid (HCl). If 14.0 g of Al(OH) 3 is present in an antacidtablet, determine the theoretical yield of aluminum chloride producedwhen the tablet reacts with stomach acid. If the actual yield ofaluminum chloride from this tablet is 22.0 g, what is the percentyield?Al(OH) 3 (s) + 3HCl (aq) AlCl 3 (aq) + 3H 2 O (l)9. Zinc reacts with iodine in a synthesis reaction. Write the balancedchemical equation for the reaction. Determine the theoretical yield if a125.0 g sample of zinc was used. Determine the percent yield if515.6g is recovered.10. Upon heating, calcium carbonate decomposes into calcium oxide andcarbon dioxide gas. What is the theoretical yield of CO 2 if 235.0 g ofCaCo 3 is heated? What is the percent yield of CO 2 if 97.5 g of CO 2 iscollected?11. Chlorine can be prepared by the reaction of manganese )II) oxide withhydrochloric acid.MnO 2 (s) + HCl (aq) MnCl 2 (aq) + Cl 2 (g) + H 2 O (l)Balance the equation and determine the percent yield of chlorine if86.0 g of MnO 2 and 50.0 g of HCl react to form 20.0 g of chlorine.10-14HC/CC/TG KHS
Stoichiometry<strong>Exercise</strong> 8Show your work.Indicate if the following are endothermic or exothermic:1. C + H 2 0 C0 2 + 2H 2 0 - 163 kJ2. C+ 1/20 2 - 121 kJ CO3. CO+ 1/20 2 CO 2 +283 kJ4. N 2 0 4 + 58 kJ 2NO 25. Given the following balanced equation:H 2 + F 2 ---> H 2 F 2 + 5.27 x 10 5 Ja. Is the reaction exothermic or endothermic?b. Calculate the number of joules of heat energy produced in the reaction of37.0 g of fluorine gas with sufficient hydrogen gas.6. Given the following balanced equation:O 2 + 2F 2 ---> 2OF 2 - 4.60 x 10 4 Ja. Is the reaction exothermic or endothermic?b. Calculate the number of grams of fluorine gas needed for the reactionwith 8.74 x 10 3 J of heat energy and sufficient oxygen gas.10-15HC/CC/TG KHS
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Exercise 1

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