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Part A:
Write an equation for the formation of NO(g) from its elements in their standard states.
Express your answer as a chemical equation. Identify all of the phases in your answer.
Part B:
Write an equation for the formation of BF3(g) from its elements in their standard states.
Express your answer as a chemical equation. Identify all of the phases in your answer.
Part C:
Write an equation for the formation of C6H6(l) from its elements in their standard states.
Express your answer as a chemical equation. Identify all of the phases in your answer.
Part D:
Write an equation for the formation of HF(g) from its elements in their standard states.
Express your answer as a chemical equation. Identify all of the phases in your answer.
In ideal conditions of pressure and temperature the process of forming any substance is accompanied by a change in enthalpy that is known as the standard enthalpy of the formation. The standard enthalpy can be calculated for a specific reaction by looking at the difference between the established norms for the production of reactants and the products.
Part A
N2(g), the standard state of N, is
O2(g), the standard state of O, is O2(g).
The formation reaction is therefore:
1/2 N2(g) + 1/2 O2(g) -> NO(g)
Part B
Standard state of B (s)
F2(g), the standard state of F, is F2(g).
The formation reaction is therefore:
B(s) + 3/2 F2(g) -> BF3(g)
Part C
Standard state of C (s,graphite),
Standard state for H is H2(g).
The formation reaction is therefore:
6 C(s,graphite) + 3 H2(g) -> C6H6(l)
Part D
H2(g), the standard state of H, is
F2(g), the standard state of F, is F2(g).
The formation reaction is therefore:
1/2 H2(g) + 1/2 F2(g) -> HF(g)