Chemistry Practice Problems Dipole Moment Practice Problems Solution: There are two compounds of the formula Pt(NH3 )2 C...

Solution: There are two compounds of the formula Pt(NH3 )2 Cl2 as shown below. The compound on the right is called cisplatin, and the compound on the left is called transplatin.Which compound has a nonzero dipole moment?

Problem

There are two compounds of the formula Pt(NH3 )2 Cl2 as shown below. The compound on the right is called cisplatin, and the compound on the left is called transplatin.

The first structure is a central Pt single bonded below to NH3, right to Cl, left to Cl, and above to NH3.  In the second, Pt is single bonded below and right to NH3 and left and above to Cl.

Which compound has a nonzero dipole moment?

Solution

There are two possible Lewis structures for Pt(NH3)2Cl2:

Platinum (EN = 2.28) is less electronegative than nitrogen (EN = 3.04) and chlorine (EN = 3.16) so the dipole moments point away from Pt.

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