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# Thermodynamics: Energy and the First Law - PowerPoint PPT Presentation

Thermodynamics: Energy and the First Law. Egg placed in boiling water. Man stands still holding a weight at arm’s length. For this reaction H 2 (g) + (1/2)O 2 (g) → H 2 O(g) ΔH = –286 kJ/mol. is pΔV. positive, negative , zero.

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### Thermodynamics: Energy and the First Law

Eggplaced in boiling water

NEXUS/Physics Clicker Questions

Manstands still holding a weight at arm’s length.

NEXUS/Physics Clicker Questions

For this reaction H2(g) + (1/2)O2(g)→ H2O(g) ΔH = –286 kJ/mol. is pΔV

• positive,

• negative,

• zero

NEXUS/Physics Clicker Questions

For this reaction (occurring in a vessel at STP) H2(g) + (1/2)O2 (g)→ H2O(g) , ΔH = –286 kJ/mol. is the magnitude of the internal energy change (|ΔUint|)

• Greater than 286 kJ/mol?

• Less than 286 kJ/mol?

• Equal to 286 kJ/mol?

(Hint: Estimate the value of pΔV)

NEXUS/Physics Clicker Questions