A)Write a balanced chemical equation depicting the formation of one mole of CaCO

Question

A)Write a balanced chemical equation depicting the formation of one mole of CaCO3(s) from its elements in their standard states.

B)For CaCO3(s), find the value of Hf. (Use Appendix C in the textbook).

C)Write a balanced chemical equation depicting the formation of one mole of POCl3(l) from its elements in their standard states.

D)For POCl3(l), find the value of Hf. (Use Appendix C in the textbook).

E)Write a balanced chemical equation depicting the formation of one mole of C2H5OH(l) from its elements in their standard states.

F)For C2H5OH(l), find the value of Hf. (Use Appendix C in the textbook).

Explanation / Answer

A) Balanced equation,

Ca(s) + C(s) + 3/2O2(g) ---> CaCO3(s)

B) delat Hof = -1206.9 - (0) = -1206.9 kJ/mol

The standard delta H(formation) for CaCO3 is -1206.9 kJ/mol

C) 1/2P2(s) + 1/2O(g) + 3/2Cl2(g) ---> POCl3(l)

D) delat Hof = (-542.2) - (1/2 x 144.3) = -614.35 kJ/mol

2C(s) + 3H2(g) + 1/2O2(g) ----> C2H5OH(l)

E) delat Hof = (-277) - (0) = -277 kJ/mol

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