I believe the correct answer from the choices listed above is the second option. The expression (6.0 x 104) (3.1 x 10-1) is equal to 1.9 x 10^4. We only have two significant figures from the starting expression that is why we rounded of the product from 1.86 to 1.9.
<span>you have to find the differences of electronegativity for the atoms joined by the bond. if their diff is <0.4, then it's non-polar
if it's between 0.4 to 1.7 then it's polar
1.7 and up it's ionic
Electronegativity values can be found on most periodic tables.</span>