calculate the standard enthalpy change (in kJ/mol) for each of the following reactions.(a)2 Na(s) + I2(g) → 2 NaI(s) _______________kJ/mol(b)Cr2O3(s) + 3 H2(g) → 2 Cr(s) + 3 H2O(l) ___________kJ/mol(c)2 KOH(s) + CO2(g) → K2CO3(s) + H2O(g)_________________ kJ/mol(d)Na(s) + O2(g) → NaO2(s) _____________kJ/mol

Standard enthalpy of a reaction can be calculated by subtracting the sum of standard enthalpies of formation of products from the sum of standard enthalpies of formation of reactants. ∆H°reaction=∑∆H°f, products-∑∆H°f,reactantsa. 2 Na(s) + I2(g) → 2 NaI(s) ∆H°reaction=(2∆H°f, NaI)-(2∆H°f,Na+∆H°f,I2) ∆H°reaction=(2×(-288))-(2×0+0) =-576kJ/mol b. Cr2O3(s) + 3 H2(g) → 2 Cr(s) + 3 H2O(l) ∆H°reaction=(2∆H°f, Cr+3∆H°f,H2O)-(∆H°f,Cr2O3+3∆H°f,H2) ∆H°reaction=(2×(0)+3(-285.5)-(-1134+0) =277.5kJ/mol c. 2 KOH(s) + CO2(g) → K2CO3(s) + H2O(g) ∆H°reaction=(∆H°f, K2CO3+∆H°f,H2O)-(2∆H°f,KOH+∆H°f,CO2) ∆H°reaction=(-1150+(-285.5))-(2×(298.5)×+(-393.5)) =-1639kJ/mol NOTE: Standard values are taken off the table

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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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calculate the standard enthalpy change (in kJ/mol) for each of the following reactions.

(a)

2 Na(s) + I₂(g) → 2 NaI(s)

_______________kJ/mol

(b)

Cr₂O₃(s) + 3 H₂(g) → 2 Cr(s) + 3 H₂O(l)

___________kJ/mol

(c)

2 KOH(s) + CO₂(g) → K₂CO₃(s) + H₂O(g)

_________________ kJ/mol

(d)

Na(s) + O₂(g) → NaO₂(s)

_____________kJ/mol

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