THE QUESTION MARKS REPRESENT DELTA AND KNOT SYMBOL, RESPECTIVELY. Part A Find ?

Question

THE QUESTION MARKS REPRESENT DELTA AND KNOT SYMBOL, RESPECTIVELY.

Part A

Find ?H?f for CaCO3(s) from Appendix IIB in the textbook, where ?H?f (kJ/mol) is -1207.6, ?G?f (kJ/mol) is -1129.1 (kJ/mol) & S? is 91.7 (J/mol k).

Express your answer using one decimal place.

Part B

Find ?H?f for MgCO3(s) from Appendix IIB in the textbook where ?H?f (kJ/mol) is -1095.8 (kJ/mol), ?G?f (kJ/mol) is -1012.1 (kJ/mol) & S? is 65.7 (J/mol K).

Part C

Find ?H?f for C2H5OH(l) from Appendix IIB in the textbook where ?H?f (kJ/mol) is -277.6 (kJ/mol), ?G?f (kJ/mol) is -174.8 (kJ/mol) & S? is 160.7 (J/mol K).

Part D

Find ?H?f for CH3OH(l) from Appendix IIB in the textbook where ?H?f (kJ/mol) is -238.6 (kJ/mol) , ?G?f (kJ/mol) is -166.6 (kJ/mol) & S? is 126.8 (J/mol K).

Part E

Write an equation for the formation of MgCO3(s) from its elements in its standard states.

Express your answer as a chemical equation. Identify all of the phases in your answer.

Part F

Write an equation for the formation of C2H5OH(l) from its elements in its standard states.

Express your answer as a chemical equation. Identify all of the phases in your answer.

Part G

Write an equation for the formation of CH3OH(l) from its elements in its standard states.

Express your answer as a chemical equation. Identify all of the phases in your answer.

Explanation / Answer

A -  CaCO3(s) ? CaO(s) + CO2(g). ?Hf for CaCO3(s) is ?1207.1 kJ/mol; ?Hf for CaO(s) is ?635.5 kJ/mol; ?Hf for CO2(g) is ?393.5 kJ/mol.

so Enthalpy = ?Hf products - ?Hf reactants
?H = (-635.5 + -393.5) - (-1207.1)
?H = -1029 + 1207.1
?H = +178.1 kJ mol?

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