Tell what is meant by: (a) the First Law Thermodynamics (b) energy (d) bond ener

Question

Tell what is meant by: (a) the First Law Thermodynamics (b) energy (d) bond energy (e) an endothermic process (g) an exothermic process 2. What is: (a) enthalpy (b) entropy (c) enthalphy (heat) of fusion (d) enthalpy (heat of evaporation (e) specific heat? 3. I) A 5.00 g sample of octane (C_3H_12) is burnt in a bomb calorimeter containing 200.00 g of water. How much energy in (a) cal (b) joules is released if the temperature of the water increases 6.00 degreeC? ii) Is the reaction endothermic or exothermic 4. What is DeltaH for the above reaction in kJ/mol? 5. If DeltaH for the following reaction is -90 kJ/mol, what is how much heat is released if 35.0 f of carbon is burnt is an excess of oxygen? C(s) + O_2 (g) = CO_2 (g)

Explanation / Answer

1.

The first law of thermodynamics: all energy of the universe is conserved, it can't be created/destroyed

2.

energy: ability to do work

3.

bond energy --> energy required to break a bond between two species (elements)

4.

endothermic process --> energy requiring process, the final enthalpyis greather than initial enthalpy

5.

exothermic process -> energy release in the process, the initial enthalpy is greather than final enthalpy

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