Chapter 4: Energetics
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What is the definition of the standard molar enthalpy of combustion?
The enthalpy change when 1 mole of substance is completely burnt in oxygen under standard conditions, with all reactants and products in standard states
What is the equation for enthalpy change?
Q=mcΔt
What is the standared molar empalthy of formation,ΔH f^θ.
This is the enthalpy change when 1 mole of substance is formed from its constituent elements under standared conditions, also everything is in there standared states.
What is Standard enthalpy change of combustion, ΔH°c.
The standard enthalpy change of combustion of a compound is the enthalpy change which occurs when one mole of the compound is burned completely in oxygen under standard conditions, and with everything in its standard state.
What are the standared conditions?
Temprature = 298K (25 degree C) Pressure = 100 KPa (100,000 Pa)
Whats the definition of Hess’s law?
The enthalpy change of a chemical reaction is the same whatever route its taken from reactants to products