Why will heat travel faster in solids than in liquids

Which statement justifies that phosphine (ph3) is a polar molecule?

Sodium nitrite (nano2) reacted with 2−iodooctane to give a mixture of two constitutionally isomeric compounds of molecular formula c8h17no2 in a combined yield of 88%. draw reasonable structures for these two isomers. click the "draw structure" button to launch the drawing utility. place the two compounds in the appropriate boxes below.

Which electron configuration represents the electrons in an atom of sodium in the ground state at stp