Can a molecule with all polar bonds be non-polar? Explain, using an example molecule.

Asolution contains 225 g of sodium chloride, nacl, dissolved in enough water to make a 0.25 l of solution. what is the molarity of the solution? a. 3.88 m, b. 1.03 m, c. 1.5 m, d. 15.5 m

Can someone me with 1 to 4 plz. fast

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.