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.

Step 1

Part A)

The change in electrical potential energy is,

Step 2

Part B)

The absolute tem...

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