Standard thermodynamic quantities for selected substances at 25C Part A: What is

Question

Standard thermodynamic quantities for selected substances at 25C

Part A:

What is the value of Hf for the formation of 1 mol of RbCl(s)?

Express the energy to four significant figures and include the appropriate units.

Part B

Enter the chemical equation for the formation of Pb(NO3)2(s) from its respective elements in their standard states.

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

Substance Hf(kJ/mol) Rb(s) 0.0 Rb(g) 80.9 Cl(g) 121.3 Cl2(g) 0.0 RbCl(s) 435.4 Pb(s) 0.0 Pb(g) 195.2 Pb(NO3)2(s) 451.9 N(g) 472.7 N2(g) 0.0 O(g) 249.2 O2(g) 0.0 O3(g) 142.7

Explanation / Answer

Part A

Enthaply of formation of RbCl(s) = -435.4 kJ/mol

Part B

Pb(s) + N2(g) + 3O2(g) ------------> Pb(NO3)2 (s)

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