Spontaneous Reaction Video Lessons

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Problem: A mixture of hydrogen and chlorine remains unreacted until it is exposed to ultraviolet light from a burning magnesium strip. Then the following reaction occurs very rapidly: H2 + Cl2      →       2 HCl       ΔG = - 45.54 kJ                                               ΔH = - 44.12 kJ                                               ΔS = - 4.76 J/k Select the statement below which BEST explains this behavior. A. The reactants are thermodynamically more stable than the products. B. The reaction has a small equilibrium constant. C. The ultraviolet light raises the temperature of the system and makes the reaction more favorable. D. The negative value for ΔS slows down the reaction. E. The reaction is spontaneous by thermodynamics, but the reactants are kinetically stable.

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Problem Details

A mixture of hydrogen and chlorine remains unreacted until it is exposed to ultraviolet light from a burning magnesium strip. Then the following reaction occurs very rapidly:

H2 + Cl2      →       2 HCl       ΔG = - 45.54 kJ

                                              ΔH = - 44.12 kJ

                                              ΔS = - 4.76 J/k

Select the statement below which BEST explains this behavior.

A. The reactants are thermodynamically more stable than the products.

B. The reaction has a small equilibrium constant.

C. The ultraviolet light raises the temperature of the system and makes the reaction more favorable.

D. The negative value for ΔS slows down the reaction.

E. The reaction is spontaneous by thermodynamics, but the reactants are kinetically stable.

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Spontaneous Reaction concept. You can view video lessons to learn Spontaneous Reaction. Or if you need more Spontaneous Reaction practice, you can also practice Spontaneous Reaction practice problems.

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Our expert Chemistry tutor, Jules took 4 minutes and 14 seconds to solve this problem. You can follow their steps in the video explanation above.

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Based on our data, we think this problem is relevant for Professor Navarro's class at BMCC CUNY.