Use Hess's Law to Calculate the Enthalpy Change for the Reaction

question 46

Multiple Choice

Use Hess's Law to calculate the enthalpy change for the reaction
WO₃(s) + 3H₂(g)  W(s) + 3H₂O(g)
From the following data:
2W(s) + 3O₂(g)  2WO₃(s) H = -1685.4 kJ
2H₂(g) + O₂(g)  2H₂O(g) H = -477.84 kJ

• A) 125.9 kJ
• B) 252.9 kJ
• C) 364.9 kJ
• D) 1207.6 kJ
• E) none of the above

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Definitions:

Upsloping Line

In economics, represents a graph where the value or quantity increases as another variable increases, often seen in supply curves.

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Graphs that depict the average total costs of production at different levels of output, illustrating economies or diseconomies of scale.

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A market structure characterized by a large number of sellers offering identical products, where no single seller can influence market prices.

Marginal Revenue

The extra income a company earns by selling an additional unit of a product or service.