enthalpy changes

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6 Terms

1
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Enthalpy

heat content stored in a chemical system

2
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Enthalpy change

heat exchange with surroundings at constant temp.

3
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Standard conditions

Temp= 298K

Pressure= 100kPa

Conc= 1M

4
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Exothermic

NEGATIVE

Releasing energy to surroundings (increase in temp).

Enthalpy of products is less than enthalpy of reactants due to energy being lost to sureoundings.

5
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Endothermic

POSITIVE

Energy taken in from the surroundings (decrease in temp).

Enthalpy of products is greater than reactants as energy has been taken in from sureoundings.

6
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Calculating heat capacity

  • Heat energy transferred:

Energy transferred:

(q = M x C x temp change / 1000)

M= vol C= 4.18 x temp change

DIVIDE BY

(moles of fuel used)