Consider the chemical equations shown here.
2H, (9)+0,(g) → 2H, O(9) AH, = -483.6 kJ + 2 = -241.8 kJ/mol
30,(9) ► 20,(g) AH, = 284.6 kJ = 2 = 142.3 kJ/mol
What is the overall enthalpy of reaction for the equation shown below?
3H2(9)+02 (9). 310 ()

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Ageochemist examines a piece of metal that he found in the soil. he performs tests to identify the metal from its density, electrical conductivity, and melting point. which statement best describes his investigation? a. he is determining physical properties that are sufficient to identify the metal. b. he is determining chemical properties that are sufficient to identify the metal. c. he is determining physical properties that are insufficient to identify the metal. d. he is determining chemical properties that are insufficient to identify the metal.

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