Enthalpy L1

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4 Terms

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Enthalpy change definition

Enthalpy Change = heat change of constant temperature

Occurs under standard conditions

Temp = 298K

Pressure = 100kPa

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Formula for Enthalpy

q = mcΔT

q = heat lost or gained (J)

m = mass of solution/water (g)

c = specific heat capacity of water, 4.18 (Jg^-1K^-1)

ΔT = Temperature change

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Standard Enthalpy of combustion

(ΔcH^θ) when 1 mole of a stub stance is completely burned by oxygen under standard conditions with all substances in their standard state.

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Steps to solving

1) calculate heat change (q)

2) convert to KJ by /1000

3) calculate number of moles (Mass/Mr)

4) calculate per mole (KJ/moles)