Please show step by step.? consider the following three reactions: 2Fe (s) + 6HC
ID: 730514 • Letter: P
Question
Please show step by step.?consider the following three reactions:
2Fe (s) + 6HCl (aq) -----> 2FeCl3 (aq) + 3H2 (g) delta H (A)
Fe2O3 (s) + 6HCl (aq) -----> 2FeCl3 (aq) + 3H2O (l) delta H (B)
2H2 (g) + O2 (g) -----> 2H2O (l) delta H (C)
Show how these equations must be summed together according to Hess's law to determine delta H for the combustion of iron (target equation shown below). Also show clearly how the delta H values of each of the three reactions must be manipulated to determine the enthalpy of combustion of iron.
4 Fe (s) + 3 O2 (g) -----> 2 Fe2O2 (s) delta H = ?
Explanation / Answer
2Fe (s) + 6HCl (aq) -----> 2FeCl3 (aq) + 3H2 (g) delta H (A) Fe2O3 (s) + 6HCl (aq) -----> 2FeCl3 (aq) + 3H2O (l) delta H (B) 2H2 (g) + O2 (g) -----> 2H2O (l) delta H (C) 4 Fe (s) + 3 O2 (g) -----> 2 Fe2O2 (s) delta H = ? [2 delta H(A) - 2 delta H(B)-2dH(c) ] = delta H for iron