Calorimetry Problems Chapter 6 part 3. Calorimetry Constant Pressure: measures enthalpy of rxn –coffee cup calorimetry Constant Volume: measures internal.

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Presentation transcript:

Calorimetry Problems Chapter 6 part 3

Calorimetry Constant Pressure: measures enthalpy of rxn –coffee cup calorimetry Constant Volume: measures internal energy of rxn –bomb calorimetry

Constant Pressure

Calculating the Heat q rxn + q solution + q calorimeter = 0 (overall no energy is lost/gained) q rxn = ? q solution =mC∆T q calorimeter = C cal (∆T) –C cal is the constant either given or assumed ti be 0

Constant Pressure g of Mg is placed in 100 mL of 1.0 M HCl. And the T goes from 295 K to 318K, what is the ∆H rxn per mole of magnesium?

Constant Volume Measures heat of combustions (food calories)

Calculating Heat Measured the same as constant pressure q rxn + q solution + q calorimeter = 0

Constant Volume 1.00 g of C 3 H 8 is burned in a bomb calorimeter (C calorimeter = 837 J/K) containing 1.20 kg of water. The T rises from 298 K to 306 K. What is the heat of combustion per mole of octane?

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