Asked by Anonymous
How many kilojoules of heat are absorbed when 40.7g of MgO(s) is decomposed into Mg(s) and O2 (g) at constant pressure?
Answers
Answered by
DrBob222
2Mg + O2 ==> 2MgO
Look up dHf for MgO, which will be some number/mol and multiply by 2 for 2MgO.
See this link to find it.
http://en.wikipedia.org/wiki/Standard_enthalpy_change_of_formation_%28data_table%29
Then dHf x [(40.7/(2*40.3)] = ? and change the - sign to +.
Look up dHf for MgO, which will be some number/mol and multiply by 2 for 2MgO.
See this link to find it.
http://en.wikipedia.org/wiki/Standard_enthalpy_change_of_formation_%28data_table%29
Then dHf x [(40.7/(2*40.3)] = ? and change the - sign to +.
Answered by
Llui
0.5
Answered by
ihatechem
-30.1 kj
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