21. 250. 0 ml of 1.00 M NAOH solution has a density of 1.90 g/mL. Calculate the concentration of this solution in molality. A. 5.26 x 10m B. 0.760 m C.0.526 m D. 0.131 m 22. An ideal solution contains 92. 1 g of glycerin, C,H,(OH), and 184.4 g of ethanol, C,H,OH, at 40 °C. The vapor pressure of pure ethanol is 0.178 atm at 40 °C. What is the molality of the solution? What is the vapor pressure of a solution? 5.43 m, 57.86 torr D. 5.43 m, 23.4 torr B. 21.7 m, 90.34 torr C. 21.7 m, 12.56 torr 23. Salt could be added to ice to lower the melting temperature of the ice so it easily freezes the ice cream mixture. If 3.5 m of salt was added to ice, determine its new freezing point. A. 6.0 °C D. -6.5 °C B. -6.0 °C C. 6.5 °C 24. Two moles of aluminum was heated from 45 °C to 93 °C. Calculate the amount of heat absorbed by aluminum. Specific heat of Al= 0.90 J/g-K A. 1333 J 4333 J B. 2333 J C. 3333 J D. 25. Calculate the standard enthalpy change, AH", for the following reaction: 2CH,OH, + 30 2 CO + 4H,0, Given: CH,OH CO H,O, AHP = -238.7 kJ/mol AH, = -393.5 kJ/mol AH = -285.8 k 3kJ/mol A -918 kJ/mol B. +918 kJ/mol C. -1452.8 kJ/mol D. +1452.8 kJ/mol

21. 250. 0 ml of 1.00 M NAOH solution has a density of 1.90 g/mL. Calculate the concentration of this solution in molality. A. 5.26 x 10m B. 0.760 m C.0.526 m D. 0.131 m 22. An ideal solution contains 92. 1 g of glycerin, C,H,(OH), and 184.4 g of ethanol, C,H,OH, at 40 °C. The vapor pressure of pure ethanol is 0.178 atm at 40 °C. What is the molality of the solution? What is the vapor pressure of a solution? 5.43 m, 57.86 torr D. 5.43 m, 23.4 torr B. 21.7 m, 90.34 torr C. 21.7 m, 12.56 torr 23. Salt could be added to ice to lower the melting temperature of the ice so it easily freezes the ice cream mixture. If 3.5 m of salt was added to ice, determine its new freezing point. A. 6.0 °C D. -6.5 °C B. -6.0 °C C. 6.5 °C 24. Two moles of aluminum was heated from 45 °C to 93 °C. Calculate the amount of heat absorbed by aluminum. Specific heat of Al= 0.90 J/g-K A. 1333 J 4333 J B. 2333 J C. 3333 J D. 25. Calculate the standard enthalpy change, AH", for the following reaction: 2CH,OH, + 30 2 CO + 4H,0, Given: CH,OH CO H,O, AHP = -238.7 kJ/mol AH, = -393.5 kJ/mol AH = -285.8 k 3kJ/mol A -918 kJ/mol B. +918 kJ/mol C. -1452.8 kJ/mol D. +1452.8 kJ/mol

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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