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H2(g)

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AP Chemistry

Definition

Hydrogen gas, represented by H2(g), is an elemental form of hydrogen consisting of two hydrogen atoms bonded together.

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Practice Questions (6)

For which of the following processes would ∆S be negative? I. 2Fe2O3 (s) -> 4Fe(s) + 3O2 (g) ; II. Mg2+ + 2OH- -> Mg(OH)2 (s) ; III. H2(g) + C2H4(g) -> C2H6(g)
For which of the following processes would ∆S be negative? I. 2Fe2O3 (s) -> 4Fe(s) + 3O2 (g) ; II. Mg2+ + 2OH- -> Mg(OH)2 (s) ; III. H2(g) + C2H4(g) -> C2H6(g)
A mechanism is shown below: [Step 1: 2NO(g) ⇄ N2O2(g) (fast)] [Step 2: N2O2(g) + H2(g) → N2O(g) + H2O(g) (slow)] [Step 3: N2O(g) + H2(g) → N2(g) + H2O(g) (fast)] Which of the following defines he overall chemical equation?
For the reaction N2(g) + 3H2(g) ⇌ 2NH3(g), K = 3.0 x 10^-2 at a certain temperature. Which of the following statements is true?
The formation of ammonia is represented by the following chemical reaction N2(g)+3H2(g)⇌2NH3(g), with the equilibrium constant for this reaction at 298 K being 5.43*10^-4. If the reaction were reversed and the stochiometric coefficients doubled, what would be the new equilibrium constant?
The enthalpy of change for the reaction H2(g) + 1/2 O2(g) → H2O (g) is -71.2 kJ/mol. The enthalpy of change for the reaction C2H2(g) + 2H2(g) → C2H6(g) is -94.5 kJ/mol. The enthalpy of change for the reaction C2H6(g) + 7/2 O2(g) → 2CO2(g) + 3H2O(g) is -283 kJ/mol. What is the enthalpy of change for the reaction 4CO2(g) + 2H2O(g) → 2C2H2(g) + 5O2(g)?

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