What NaCl concentration results when 229 mL of a 0.890 M NaCl solution is mixed with 502 mL of a 0.270 M NaCl solution? concentration: M

What NaCl concentration results when 239 mL of a 0.840 M NaCl solution is mixed with 582 mL of a 0.390 M NaCl solution? concentration: M

What NaCl concentration results when 264 mL of a 0.760 solution M NaCl solution is mixed with 632 mL of a 0.440 M NaCl solution?

A) How many mL of a 0.158 M aqueous solution of sodium nitrate, NaNO3, must be taken to obtain 1.58 grams of the salt? _________ mL   B)  How many mL of a 0.193 M aqueous solution of ammonium fluoride, NH4F must be taken to obtain 3.14 grams of the salt? _________ mL   C) How many grams of sodium nitrate, NaNO3, are required to make a 4.32 %(w/v) aqueous solution in a 500. mL volumetric flask?  _______ g   D) How many grams of ammonium fluoride, NH4F, are required to make a 6.47 %(w/v) aqueous solution in a 500. mL volumetric flask?  ________ g