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How to determine if an enthalpy change is positive or negative.
When energy is taken from the surroundings, the enthalpy change is positive.
When energy is released, the energy change is negative.
How can overall enthalpy change calculated?
∆H = energy to break bonds (+ve) + energy to make bonds (-ve)
Enthalpy of formation (ΔHf) definition
The enthalpy change when one mole of a substance is produced from its elements under standard conditions.
Enthalpy of combustion (∆Hc) defintion
The enthalpy change when one mole of a substance is burned completely in oxygen under standard conditions.
How is energy from calorimetry experiment calculated?
q=mc∆T
q= energy change
m=mass
c=specific heat capacity
∆T = temperature change
Note 
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