(a) Show that the formula mass of NaCl is 58.442 ± 0.006 g/mol. 

(b) To prepare a solution of NaCl, you weigh out 2.634 (±0.002) g and dissolve it in a volumetric flask whose volume is 100.00 (±0.08) mL. Express the molarity of the solution, along with its uncertainty, with an appropriate number of digits.