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

question 22

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) ΔH = −1685.4 kJ
2H₂(g) + O₂(g) → 2H₂O(g) ΔH = −477.84 kJ

• A)125.9 kJ
• B)252.9 kJ
• C)364.9 kJ
• D)1207.6 kJ
• E)None of these choices are correct.

Understand the techniques for brake system diagnostics and repair.

Recognize the different types of braking mechanisms and their applications.

Comprehend the energy conversion process in vehicle braking systems.

Understand the roles and functions of components in air brake systems, such as air compressors, slack adjusters, and brake chambers.

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Definitions:

Male

Referring to the sex that produces small, mobile gametes, typically associated with physiological and genetic characteristics distinct from the female.

Average

A statistical measure that represents the central tendency or typical value of a set of numbers, calculated by dividing the sum of the values by their number.

Oxygen Dissociation Curve

A graph displaying the relationship between the saturation of hemoglobin with oxygen and the partial pressure of oxygen in the blood.

Percent Saturation

A measure of the degree to which a substance is saturated, expressed as a percentage of the maximum possible saturation under given conditions.