A student had to prepare 250 mL of a silver nitrate solution of known molality. Unfortunately, the container did not fit into the housing of the analytical balance, and instead the student chose to use a beam balance with a 95% CL of 0.12 g per reading. First he weighed the dry container 35.18g. Then he added dried AgNO3 (FW=169.8749 +/- 0.0028, uncertainty as sigma) to give a combined weight of 36.05 g. Finally, he added 250 mL of deionized water to give a final total combined weight of 287.34g. Calculate the molality of the solution and the 95% CL, and write the final result with correct format.