Calculate the mass percent (m/m) of a solution prepared by dissolving 41.98 g of NaCl in 151.7 g of H2O Express your answer to four significant figures.   Mass percent (m/m) =       Vinegar is a solution of acetic acid in water. If a 145 mL bottle of distilled vinegar contains 34.3 mL of acetic acid, what is the volume percent (v/v) of the solution? Express your answer to three significant figures.   Volume percent (v/v) =       Calculate the mass/volume percent (m/v) of 19.5 g NaCl in 67.5 mL of solution. Express your answer to three significant figures.   Mass/volume percent (m/v) =       Calculate the molarity (M) of 156.0 g of H2SO4 in 1.255 L of solution. Express your answer to four significant figures.   Molarity =

A 870. mL solution was made by mixing 419. mL of hexane, which has a density of 0.66 g/mL, and 469. mL of toluene, which has a density of 0.87 g/mL. Calculate the volume percent of hexane in this solution. Be sure your answer has the right number of significant digits. [ %(v/v) x10

3a.

The chlorine content of a pool with a capacity of 1.80×104 L was discovered to be 0.00145% by mass, which is well below the sanitary level of 0.00305%. How much chlorine needs to be added in order for the pool to meet the health regulation standard of 0.00305%? First draw a flowchart, then given that the pool consists of fresh water and chlorine, write the total mass (or alternatively chlorine mass) and fresh water balance equations, and then calculate the mass of chlorine in grams that needs to be added to the pool. Assume that the density of the pool water is the same as that of fresh water (1.00 kg/L), the pool is filled to its rated capacity (1.80×104 L), and that the required chlorine can be added to this capacity.