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Please help with the pre- lab exercise and questions 10 and 11

Experiment 19 Heat of Combustion: Magnesium 18, you learned about the additivity of reaction beats as you confirmed Hesss Law, In this experiment, you will use this principle as you determine a heat of reaction that would be difficult to obtain by direct measurement-the heat of combustion of magnesium ribbon. The reaction is represented by the equation This equation can be obtained by combining equations (1). (2), and (3) () MgO(s) 2 HCKaq) MgCllag)+H,00) (2) Mg (s) +2 HCIag)MgCl(ag)+H2 (g) The pre- lab portion of this experiment requires you to combine equations (1), (2), and (3) to obtain equation (4) before you do the experiment. Heats of reaction for equations (1) and (2) will be determined in this experiment. As you may already know, AH for reaction (3) is-285.8 kJ. OBJECTIVES In this experiment, you will .Combine three chemical equations to obtain a fourth. . Use prior knowledge about the additivity of reaction heats. . Determine the heat of combustion of magnesium ribbon. Figure I

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