g You titrate an unknown sample of oxalic acid (H2C2O4 (aq)) to determine its concentration. After noting the volume of the oxalic sample is 112.6 mL, you add a few drops of phenolphthalein indicator and titrate to the endpoint using 45.2 mL of a standardized 1.5 M NaOH solution. Find the molarity of the oxalic acid sample.

Solid tin exists in two forms: white and gray. for the transformation sn(s, white) → sn(s, gray) the enthalpy change is -2.1 kj/mol and the entropy change is -7.4 j/(mol*k). a. calculate the gibbs free energy change for the conversion of 1.00 mol white tin to gray tin at -30℃. b. will white tin convert spontaneously to gray tin at -30℃? c. at what temperature are white and gray tin thermodynamically equivalent at a pressure of 1 atm?