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H2O(g)

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AP Chemistry

Definition

Water vapor, represented by H2O(g), is the gaseous form of water. It consists of two hydrogen atoms bonded to one oxygen atom.

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Practice Questions (4)

Predict the sign of ∆S for the following reaction: Mg(OH)2 (s) -> MgO(s) + H2O(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?
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)?
What is the enthalpy change for the reaction: C2H2(g) + 5/2O2(g) → 2CO2(g) + H2O(g) given the following chemical equations: (1) C2H2(g) + 5/2O2(g) → 2CO(g) + H2O(g) ΔH = -636.1 kJ/mol; (2) CO(g) + 1/2O2(g) → CO2(g) ΔH = -283.0 kJ/mol; (3) C2H2(g) + 5/2O2(g) → 2CO2(g) + H2O(g) ΔH = -1299.5 kJ/mol?

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