A chemist must prepare 600.0 mL of sodium hydroxide solution with a pH of 12.40 at 25 °C. He will do this in three steps: • Fill a 600.0 mL volumetric flask about halfway with distilled water. • Weigh out a small amount of solid sodium hydroxide and add it to the flask. • Fill the flask to the mark with distilled water. Calculate the mass of sodium hydroxide that the chemist must weigh out in the second step. Round your answer to 2 significant digits.

A chemist must prepare 600.0 mL of sodium hydroxide solution with a pH of 12.40 at 25 °C. He will do this in three steps: • Fill a 600.0 mL volumetric flask about halfway with distilled water. • Weigh out a small amount of solid sodium hydroxide and add it to the flask. • Fill the flask to the mark with distilled water. Calculate the mass of sodium hydroxide that the chemist must weigh out in the second step. Round your answer to 2 significant digits.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Weight percent tungsten 0 30 5060 70 80 3600 uLtt 90 100 3400 - 3422°C 3200 L 3000 2800 2665°C 2670°C 2600 C 2600 2580 C 99.8 54 57 66 68 73 2400 2365 C 2337 C 37 48 2200 - 2170'C 2110°C (W) 2092°C 2020°C 51 2000 1970 C 17 (BB) 18 29.5 1800 10 20 30 40 50 60 70 80 90 100 Atomic percent tungsten Answer the following questions with reference to the Boron-Tungsten binary phase diagram shown above. 1. What is the melting point of pure boron? 2. What is the melting point of pure tungsten? 3. At what composition and temperature does the lowest-temperature eutectic in this system occur? 4. At what composition and temperature does the highest-temperature eutectic in this system occur? 5. List all of the known intermetallic compounds in this system. Temperature (°C) B,W. Mad BW,
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Edit View History Bookmarks People Tab Window Help O Questi x L 2021-0 x M [EXTE! X Dashb x O Launc O Launcix S Class eto.mheducation.com/ext/map/index.html?_con%3con&external_browser=0&launchUrl=https%253A%252F%252 20 Problem Set Saved attempts left Check my work Enter your answer in the provided box. Find AG for the following reaction, at 25°C, using AH and S values. f NHẠCI(s) → NH3(g) + HCI(g) kJ Standard Thermodynamic Values at 298 K Substance or Ion AH (kJ/mol) (J/mol K) HCI(g) HCI(aq) NH3(g) • NH3(aq) NH,CI(s) -92.3 186.79 55.06 -167.46 -45.9 193 -80.83 110 -314.4 94.6 ( Prey 6 of 15