How many grams of solid barium sulfate form when 21.2 mL of 0.160 M barium chloride reacts with 66.6 mL of 0.055 M sodium sulfate? Aqueous sodium chloride is the other product.

12. complete each of the following word equations for synthesis reactions. a. sodium + oxygen -> b. magnesium + fluorine -> 13. complete and balance the equations for the decomposition reactions. a. hgo -> [with the triangle heat symbol above the arrow] b. h2o(l) -> [with "electricity" written above the arrow]

Can someone me with these questions plz.

Although respiratory organs vary across different organisms, they all contain respiratory surfaces that have a large surface area and are extremely thin. explain why having an extremely thin respiratory surface with a large surface area is advantageous for the process of gas exchange