A student finds the mass of an empty flask to be 25.631 g. After the flask is filled to the halfway mark with distilled water at 22.0 ˚C (d = 0.99777 g/cm3), the mass of the flask and water is 35.432 g. The student then forms a solution by adding some sodium hydroxide pellets and stirring the flask’s contents until the pellets dissolve. The mass of the flask, and its contents, is now 36.138 g, but the volume remains the same, still at the halfway mark. What is the density of the sodium hydroxide solution?

Calculate the enthalpy of the following reaction: 4 b (s) + 3 o2 (g) → 2 b2o3 (s) given the following pertinent information: (a) b2o3 (s) + 3 h2o (g) → 3 o2 (g) + b2h6 (g), δhoa = +2035 kj (b) 2 b (s) + 3 h2 (g) → b2h6 (g), δhob = +36 kj (c) h2 (g) + latex: \frac{1}{2} 1 2 o2 (g) → h2o (l), δhoc = −285 kj (d) h2o (l) → h2o (g), δhod = +44 kj

Why is silver chloride is an ionic compound

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.