An analytical chemist weighs out 0.116 g of an unknown diprotic acid into a 250 mL volumetric flask and dilutes to the mark with distilled water. He then titrates this solution with 0.1500 M NaOH solution. When the titration reaches the equivalence point, the chemist finds he has added 13.1 mL of NaOH solution. Calculate the molar mass of the unknown acid. Round your answer to 3 significant digits.

Which of the following is not a type of operating system? A) Real-time B) Network C) Distributed D) Sequential

Out of zinc and tin whose coating is better to protect iron objects?

Questions: 1. What is the difference in melting characteristics between a pure metal element and an alloy metal? 2. What is thermal conductivity as a material property? 3. Why are metals better conductors of electricity than ceramics and polymers? 4. What is an electrolyte? Problems: 1. During a tensile test in which the starting gage length = 125.0 mm and the cross-sectional area = 62.5 mm2 , the following force and gage length data are collected (1) 17,793 N at 125.23 mm, (2) 23,042 N at 131.25 mm, (3) 27,579 N at 140.05 mm, (4) 28, 913 N at 147.01 mm, (5) 27,578 N at 153.00 mm, and (6) 20,462 N at 160.10 mm. The maximum load is 28,913 N and the final data point occurred immediately prior to failure. (a) Plot the engineering stress strain curve. Determine (b) yield strength, (c) modulus of elasticity, and (d) tensile strength.