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1 Determine the enthalpy for this reaction: MgCl2(s) + 2NAOH(aq)------> Mg(OH)2(s)+2NACl(aq) Express your answer in kilojoules per mole to four significant figures
1 Determine the enthalpy for this reaction:
MgCl2(s) + 2NAOH(aq)------> Mg(OH)2(s)+2NACl(aq)
Express your answer in kilojoules per mole to four significant figures.
The following table lists some enthalpy of formation values for selected substances.
Substance ----------delta Hf (kJ/mol)
NAOH (aq)------ (-469.1)
MgCl2 (s)-------- (-641.8)
NaCl (aq)----- (-407.3)
Mg(OH)2 (s) ----- (-924.5)
H2O (l) --------- (-285.8)
2. Consider the reaction:
Mg(OH)2 (s) ------> MgO (s) + H2O (l) with enthalpy of rxn delta Hrxn =37.50 kJ/mol.
What is the enthalpy of formation of MgO(s)?
Express your answer in kilojoules per mole to four significant figures.
Expert Solution
MgCl2(s) + 2NaOH(aq)------> Mg(OH)2(s) + 2 NaCl(aq)
ΔH = Σ (Hf (products)) - Σ (Hf(reactants))
= [ Hf(Mg(OH)2) + 2*Hf (NaCl)] - [ Hf (MgCl2) + 2 * Hf (NaOH) ]
= [ (-924.5 kJ/mol) + 2 (-407.3 kJ/mol)] - [ (-641.8 kJ/mol) + 2 (-469.1 kJ/mol)]
= -159.1 kJ
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