thermo_p2 - 3 When 2moles of magnesium reacts with oxygen...

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Thermo Practice Problems #2 Clemens 1. 2.896g of methanol (CH 3 OH) was burned in a bomb calorimeter with a heat capacity of 2.56kJ/ o C. The bomb was immersed in 1900.g of water. After combustion, the temperature of the calorimeter and water rose by 6.33 o C. Calculate the heat of combustion of methanol in kJ/mol. The specific heat of water is 4.18J/g o C. 2. How much copper metal(c = 0.385J/g o C) in grams at an initial temperature of 355 o C would be required to vaporize 175mL of water at 100. o C. The heat of vaporization for water is 44.0kJ/mol.
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Unformatted text preview: 3. When 2moles of magnesium reacts with oxygen, magnesium oxide is produced and 1204kJ of heat is released. a) write a balanced, thermochemical equation for this. b) Is this reaction endothermic or exothermic? c) How much heat is produced when 2.4g of magnesium reacts with excess oxygen? d) How much heat is produced when 2.5L of oxygen at 765Torr and 25 o C reacts with excess Mg? e) Using your answer from d , how much water could be heated from 25 o C to 75 o C?...
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