An unknown acid is dissolved in 25 mL of water and titrated with 0.100 M NaOH. The results are shown in the titration curve below. Which of the following could be the unknown acid? A Fluoroacetic acid, pKa = 2.6 B Glycolic acid, pKa = 3.8 C Propanoic acid, pKa = 4.9 D Hypochlorous acid, pKa = 7.5 E Boric acid, pKa = 9.3

What is the volume of the fluid in the graduated cylinder with accuracy and measured to the correct degree of precision? 41.2 ml 42.0 ml 41.23 ml 41.89 ml

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.

Using this reversible reaction, answer the questions below: n2o4 2no2 (colorless) (reddish-brown) -as the temperature increased, what happened to the n2o4 concentration? -was the formation of reactants or products favored by the addition of heat? -which reaction is exothermic? right to left or left to right? -if the change of enthalpy of this reaction when proceeding left to right is 14 kcal, which chemical equation is correct? n2o4 2no2 + 14 kcal n2o4 2no2, hr = +14 kcal n2o4 + 14 kcal 2no2 n2o4 2no2, hr = -14 kcal