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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: Principles and Practice
Chemistry: Principles and Practice
3rd Edition
ISBN:9780534420123
Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Chapter12: Solutions
Section: Chapter Questions
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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 Jig-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 AH = -238.7 kJ/mol AH = -393.5 kJ/mol AH = -285.8 kJ/mol H,O A. -918 kJ/mol B. +918 kJ/mol C. -1452.8 kJ/mol D. +1452.8 kJ/mol
Transcribed Image Text: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 Jig-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 AH = -238.7 kJ/mol AH = -393.5 kJ/mol AH = -285.8 kJ/mol H,O A. -918 kJ/mol B. +918 kJ/mol C. -1452.8 kJ/mol D. +1452.8 kJ/mol
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