What is the first law of Thermodynamics? When gasoline burns in a car engine, th

Question

What is the first law of Thermodynamics? When gasoline burns in a car engine, the heat released causes the products CO_2 and H_2O to expand, which pushes the pistons outward. Excess heat is removed by the car's radiator. If the expanding gases do 451 J of work on the pistons and the system releases 325J to the surroundings as heat, calculate the change in energy (delta E) in J, kJ, and kcal. (delta E = w + q) What is the sign of work? What is the sign of heat? What is the change in energy (delta E) in J? What is the change in energy (delta E) in kJ? What is the change in energy (delta E) in kcal? Determine the exothermic and endothermic for the following processing based on the Enthalpy diagrams.

Explanation / Answer

1. Ist law of thermodynamics is based on law of conservation of energy according to which energy can neither be created nor be destroyed but it can be converted from one form to other form.

Mathemically ist law is:-

Total change in internal energy is equal to sum of work done on system and heat absorbed by system.

Change in internal energy =q+w

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