Firefox File Edit View History Bookmarks Yahoo! Tools Window Help O S 4) 30% D F

Question

Firefox File Edit View History Bookmarks Yahoo! Tools Window Help O S 4) 30% D Fri Mar 20 6 48 PM a E WWN 7496 Homework 9- d... x ii 3 smartwork wwnorton.co 397563 m/sw/mod/smartwork/view.php?id a Search Search YAHOO uncc 49er WO WN OMEWO RIDA te, Print Calculator Periodic Table book Question 17 of 18 (1 point) x Incorrect Baking soda decomposes on heating as follows, creating the holes in baked bread: 129.3 kJ mol Calculate the standard molar enthalpy of formation of NaHCO3(s) from the enthalpy of the baking soda decomposition reaction and the following information: AH Na,CO 31 J mol AH coalg 394 kJ mol AH HOCI 286 kJ mo Number JI mol Tools v Check Answer View Solution Hint 10 11 12 13 14 15 16 Progress Record my Grade

Explanation / Answer

2NaHCO3 ===> Na2CO3 + H2O + CO2

deltaH NaHCO3 = -948kJ/mole

deltaH Na2CO3 = -1131kJ/mole

deltaH H2O = -286kJ/mole

deltaH CO2 = -394kJ/mole

deltaH rxn =-129.3kJ/mole
---------------------------------------------------------------------------------------------------------
deltaH rxn = sum deltaH products - sum deltaH reactants

-129.3 = (-394 - 286 - 1131) - (2xdeltaH NaHCO3)

(2xdeltaH NaHCO3) =1681.7 kJ. endothermic

deltaH NaHCO3 =840.85 = 84*10 kJ/mole

===================================================

the number is 84

========================================

Related Questions

Navigate

• Browse (All)
• Browse F
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.