Calorimetry

Two fuel samples were combusted using the same calorimeter. When 0.5402 g of the first fuel was burned, the temperature of the calorimeter increased by 1.57 degrees Celsius. When 0.3263 g of the second fuel was burned, the temperature increase was 1.23 degrees Celsius. The chemical energy of the first sample was 23.6 kJ/g. Calculate the chemical energy of the second fuel sample.

Enthalpy of Formation

Calcium metal burns according to the following equation: Ca(s) + 1/2 O2(g) --> CaO (s). When 1.00 g of calcium metal is burned in a constant pressure calorimeter with a heat capacity of 15.20 kJ/K, the temperature increases by 1.04 degrees Celcius. Calculate the enthalpy of formation of calcium oxide. Compare this answer with -635.09 kJ/mol.

Chemistry-Thermodynamics

When an explosive is detonated inside a shell or cartridge case, the explosion effectively takes places in a closed or fixed volume container. (The chemical decomposition is fast compared to the rate at which the projectile can gain velocity.) You can make an estimate of the explosion temperature if you assume a constant volume, and if you know the chemical equation for the decomposition and have an estimate of the constant-volume heat capacities of the gases produced by the detonation. The explosive RDX decomposes according to the balanced equation C3H6N6O6 -->3CO + 3H20 + 3N2. Approximate values of C(subscript v) of the product gases are CO = 27 J/mol/K, H20 = 41 J/mol/K, and N2 = 27 J/mol... click for more

Thermodynamics

Estimate the temperature inside a cylinder of an internal combustion engine just after the spark has ignited the fuel. You are provided with the following list of assumptions. Assume the cylinder has a volume of 10 liters. Assume that the oxidant is air containing 20% oxygen. Assume that the fuel is octane (C9H18, molar mass = 114 g/mol) with an energy content of 47.7 kJ/g. Assume that the combustion is complete and uses all of the oxygen in the cylinder based on an intake temperature of 298 K and an intake pressure of 1 atmosphere. Assume that the constant-volume heat capacities of carbon dioxide, water, and nitrogen are respecively 45, 35, and 25 J/mol/K.

Mass - Aspirin Question

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