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67. What volume of a 0.20-M K2SU4 68. The US Environmental Protection Agency (EPA) places limits on the quantities of toxic substances that m discharged into the sewer system. Limits have been established for a variety of substances, including hexavaler chromium, which is limited to 0.50 mg/L. If an industry is discharging hexavalent chromium as potassium dichromate (K2C12O7), what is the maximum permissible molarity of that substance?

67. What volume of a 0.20-M K2SU4 68. The US Environmental Protection Agency (EPA) places limits on the quantities of toxic substances that m discharged into the sewer system. Limits have been established for a variety of substances, including hexavaler chromium, which is limited to 0.50 mg/L. If an industry is discharging hexavalent chromium as potassium dichromate (K2C12O7), what is the maximum permissible molarity of that substance?

Chemistry
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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Hello I am having trouble understanding problem number 68 of an experts result of WHY the molarity is  4.8 x 10 ^-6 M from the equation number of moles = mass over molar mass (mol=mass/mm) because I don't recall using that formula before I only know the step using molarity=moles/volume?

Given: Amount of hexavalent chromium3D0.50 mg/L. Mass of hexavalent chromium = 0.50 mg Volume of hexavalent chromium solution3 1.0 L Molar mass of hexavalent chromium =51.996 g/mol Step 2 Calculation for number of moles of hexavalent chromium: mass number of moles molar mass 0.5 x 10 3 number of moles 51.996 g/mol number of moles 9.616 x 106 moles
Transcribed Image Text:Given: Amount of hexavalent chromium3D0.50 mg/L. Mass of hexavalent chromium = 0.50 mg Volume of hexavalent chromium solution3 1.0 L Molar mass of hexavalent chromium =51.996 g/mol Step 2 Calculation for number of moles of hexavalent chromium: mass number of moles molar mass 0.5 x 10 3 number of moles 51.996 g/mol number of moles 9.616 x 106 moles
HCI would be require 67. What volume of a 0.20-M K,SO4 solution contains 57 g of K2SO4? 68. The US Environmental Protection Agency (EPA) places limits on the quantities of toxic substances that me discharged into the sewer system. Limits have been established for a variety of substances, including hexayalen chromium, which is limited to 0.50 mg/L. If an industry is discharging hexavalent chromium as potassium dichromate (K,Cr,O7), what is the maximum permissible molarity of that substance? 3.4 Other Units for Solution Concentrations nnoontratod solution of nitric acid (68.0% HNO3 by mass) is neede
Transcribed Image Text:HCI would be require 67. What volume of a 0.20-M K,SO4 solution contains 57 g of K2SO4? 68. The US Environmental Protection Agency (EPA) places limits on the quantities of toxic substances that me discharged into the sewer system. Limits have been established for a variety of substances, including hexayalen chromium, which is limited to 0.50 mg/L. If an industry is discharging hexavalent chromium as potassium dichromate (K,Cr,O7), what is the maximum permissible molarity of that substance? 3.4 Other Units for Solution Concentrations nnoontratod solution of nitric acid (68.0% HNO3 by mass) is neede
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