13.) The hydrogenation of ethene gas under standard conditions (T = 298.15 K) shows a decrease in disorder (AS = -0.1207 kJ/(mol•K)) during an exothermic reaction (AH = -136.9
kJ/mol). Determine whether the reaction is spontaneous or nonspontaneous by calculating AG'.
C2H4 (g) + H2 (g) → C2H6 (g)

Calculate the number of moles of ethane in 100 grams

Match the mixture with the substance// i really need on this guys (it’s a pic btw)

Achemistry student needs to standardize a fresh solution of sodium hydroxide. he carefully weighs out of oxalic acid , a diprotic acid that can be purchased inexpensively in high purity, and dissolves it in of distilled water. the student then titrates the oxalic acid solution with his sodium hydroxide solution. when the titration reaches the equivalence point, the student finds he has used of sodium hydroxide solution.calculate the molarity of the student's sodium hydroxide solution. be sure your answer has the correct number of significant digits.