1. A solution made by dissolving 9.81 g of a nonvolatile nonelectrolyte in 90.0g of water boiled at 100.37 °C at 760 mm Hg. What is the approximate molecular weight of the substance? (For water, Kb = 0.51 °C/m) A. 150 g/mol B. 199 g/mol C. 185 g/mol D. 250 g/mol 2. Beta-carotene is usually found in carrots and spinach. Determine the molar mass ofB- carotene if 10.0 mL of a solution in chloroform containing 0.00768 g of B-carotene has an osmotic pressure of 26.57 mm Hg at 25.0 °C (1 atm3 760 mmHg) (K= °C + 273.15) D. 882 g/mol A. 538 g/mol B. 673 g/mol C. 724 g/mol 3. Calculate the enthalpy of decomposition of ammonium nitrate. Use the following enthalp values: N20(g) = 82 kJ/mole; and NH4NO3(s) = -366 kJ/mole; H20(g) =-242 kJ/mole %3D NH,NO3(s) → N2O(g) + 2H2O(g) C. 28kJ D. 95 kJ A. -36kJ B. 64 kJ

1. A solution made by dissolving 9.81 g of a nonvolatile nonelectrolyte in 90.0g of water boiled at 100.37 °C at 760 mm Hg. What is the approximate molecular weight of the substance? (For water, Kb = 0.51 °C/m) A. 150 g/mol B. 199 g/mol C. 185 g/mol D. 250 g/mol 2. Beta-carotene is usually found in carrots and spinach. Determine the molar mass ofB- carotene if 10.0 mL of a solution in chloroform containing 0.00768 g of B-carotene has an osmotic pressure of 26.57 mm Hg at 25.0 °C (1 atm3 760 mmHg) (K= °C + 273.15) D. 882 g/mol A. 538 g/mol B. 673 g/mol C. 724 g/mol 3. Calculate the enthalpy of decomposition of ammonium nitrate. Use the following enthalp values: N20(g) = 82 kJ/mole; and NH4NO3(s) = -366 kJ/mole; H20(g) =-242 kJ/mole %3D NH,NO3(s) → N2O(g) + 2H2O(g) C. 28kJ D. 95 kJ A. -36kJ B. 64 kJ

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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