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Lab%2010%20%28-%29%20-%20Standard%20Heat%20of%20Formation%20%28STUDENT%29

# Lab%2010%20%28-%29%20-%20Standard%20Heat%20of%20Formation%20%28STUDENT%29

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STANDARD HEAT OF  FORMATION Created by Jackie Jurchenko Created by Jackie Jurchenko

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MORE OF HESS’S LAW Today you will calculate the ______ heat of formation  ΔH 0 f The heat involved in the ______ of one mole of a  compound from the corresponding ______ as they  are found under standard conditions (25 0 C and 1  atm pressure). Demo: Mg(s) + ½ O 2 (g)         MgO(s) The heat evolved – ΔH 0 for MgO (s) Would be difficult to measure the heat – we will do  it indirectly and use Hess’s Law.
STEPS YOU WILL DO Mg 0 (s)  + 2 HCl (aq)       ____ (aq)  + __ (g) MgO (s)  + 2 HCl (aq)       ____ (aq)  + ____ ( l ) H 2 (g)  + ½ O 2 (g)        H 2 O ( l ) ΔH rxn 1 ΔH rxn 2 ΔH 0 f H 2 O Our goal is: Mg (s) + ½ O 2 (g) MgO (s) We can use Hess’s law and the above reactions to achieve! A B C

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Mg 0 (s)  + 2 HCl (aq)         MgCl 2 (aq)  + H 2 (g) MgCl 2 (aq)  + H 2 O ( l )        MgO (s)  + 2 HCl (aq) Mg 0 (s)  + H 2 O ( l )
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Lab%2010%20%28-%29%20-%20Standard%20Heat%20of%20Formation%20%28STUDENT%29

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