A 520-gram sample of seawater contains 0.317 moles of NaCl. What is the percent composition of NaCl in the water?
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Polarity of a molecule doesn't depend only on the presence of certain atom(s). It also depends on symmetry. For example, take the alkanes family 
. These molecules are generally nonpolar, because there is no net dipole moment. Now, dipole moment arises due to <span>difference in the electronegativity of carbon and the other element. In organic chemistry, generally these atoms are Oxygen, Halogens, Nitrogen. Because of their high electronegativity, they cause a net dipole moment resulting in polarity.
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is symmetrical and hence non-polar.
is asymmetrical and polar. It's structure is bent because of oxygen lone pairs.
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