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the ammonia molecule ( NH 3 ) has a dipole moment of 5.0× 10 −30 C⋅m . Ammonia molecules in the gas phase are placed in a uniform electric field E ⃗ with magnitude 1.9×106 N/C .Part A What is the change in electric potential energy when the dipole moment of a molecule changes its orientation with respect to E⃗ from parallel to perpendicular?Express your answer using two significant figures.Part B At what absolute temperature T is the average translational kinetic energy 3/2 kT of a molecule equal to the change in potential energy calculated in part (a)? (Note: Above this temperature, thermal agitation prevents the dipoles from aligning with the electric field.) Express your answer using two significant figures.

Question

the ammonia molecule ( NH 3 ) has a dipole moment of 5.0× 10 −30 C⋅m . Ammonia molecules in the gas phase are placed in a uniform electric field E ⃗ with magnitude 1.9×106 N/C .

Part A
What is the change in electric potential energy when the dipole moment of a molecule changes its orientation with respect to E⃗ from parallel to perpendicular?
Express your answer using two significant figures.

Part B
At what absolute temperature T is the average translational kinetic energy 3/2 kT of a molecule equal to the change in potential energy calculated in part (a)? (Note: Above this temperature, thermal agitation prevents the dipoles from aligning with the electric field.)
Express your answer using two significant figures.

 

 

 

 

 

 

check_circleAnswer
Step 1

Part A)

The change in electrical potential energy is,

(AU) pE
-(5x10 ).9x10°)
=9.5x10
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(AU) pE -(5x10 ).9x10°) =9.5x10

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Step 2

Part B)

The absolute tem...

(AU)T
(9.5x10)(38x 10)r
T 0.46 K
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(AU)T (9.5x10)(38x 10)r T 0.46 K

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