Answered: 4. Percent by Mass/Volume Concentration…

Chemistry for Engineering Students

4th Edition

ISBN:9781337398909

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter9: Energy And Chemistry

Section: Chapter Questions

Problem 9.101PAE

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4 only volume concentration

$C. he rocess s exothermic D. the process is endothermic A. the solid is insoluble B. the solid releases heat 9. Hess's Law states that a chemical reaction is independent of the routeby which chemical reactions takes place while keeping the same A. initial and final conditions B. final conditions only C. initial conditions only D. mid-conditions 10. The change in the energy between a chemical reaction and the surroundings at constant temperature is called A. enthalpy B. enthalpy change C. enthalpy profile D. dynamic enthalpy PROBLEM SOLVING Directions: Solve each of the following problem. Show your complete solutions. 1. Mole Fraction Calculate the mole fraction of hydrochloric acid (HCI) in 70% (wt/wt) aqueous HCl solution (molar masses: HCI 3D36.45 g/mol, H2O = 18 g/mol) 2. Molarity Calculate the molar concentration of a solution that contains 23 g of sodium hydroxide. NaOH in 250 ml of solution. Molar mass of NaOH is 40.01 g/mol. 3. Molality How many grams of solute is present in 2.5 moles Magnesium hydroxide, Mg(OH)2 in 669 g water, H2O? The molar mass of Mg(OH)2 is 58 g/mol. 4. Percent by Mass/Volume Concentration A 50 ml of 12% by mass per volume solution was used in an experiment. How many grams of solute does the solution contain?$

Transcribed Image Text:C. he rocess s exothermic D. the process is endothermic A. the solid is insoluble B. the solid releases heat 9. Hess's Law states that a chemical reaction is independent of the routeby which chemical reactions takes place while keeping the same A. initial and final conditions B. final conditions only C. initial conditions only D. mid-conditions 10. The change in the energy between a chemical reaction and the surroundings at constant temperature is called A. enthalpy B. enthalpy change C. enthalpy profile D. dynamic enthalpy PROBLEM SOLVING Directions: Solve each of the following problem. Show your complete solutions. 1. Mole Fraction Calculate the mole fraction of hydrochloric acid (HCI) in 70% (wt/wt) aqueous HCl solution (molar masses: HCI 3D36.45 g/mol, H2O = 18 g/mol) 2. Molarity Calculate the molar concentration of a solution that contains 23 g of sodium hydroxide. NaOH in 250 ml of solution. Molar mass of NaOH is 40.01 g/mol. 3. Molality How many grams of solute is present in 2.5 moles Magnesium hydroxide, Mg(OH)2 in 669 g water, H2O? The molar mass of Mg(OH)2 is 58 g/mol. 4. Percent by Mass/Volume Concentration A 50 ml of 12% by mass per volume solution was used in an experiment. How many grams of solute does the solution contain?

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