The standard enthalpy change for the reaction below is ΔH°rxn = −757 kJ.  3 SF4 (g)  +  4 BCl3 (g)  →  4 BF3 (g)  +  3 SCl2 (l)  + 3 Cl2 (g)       ΔH°rxn = −757 kJ Substance ΔH°f (kJ/mol) SF4 (g) –775 BCl3 (g) –404 BF3 (g) ? Cl2 (g) 0 SCl2 (l) –50   Use the information provided to calculate the standard enthalpy of formation for BF3 (g). Answer kJ/mol   The reaction shown above is Exothermic or Endothermic   How many grams of BCl3 (m.w.=117.17 g/mol) must be reacted with excess SF4 in order to produce 6000. kJ of energy? Answer grams

Chemistry & Chemical Reactivity
10th Edition
ISBN:9781337399074
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
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Chapter5: Principles Of Chemical Reactivity: Energy And Chemical Reactions
Section5.7: Enthalpy Calculations
Problem 5.10CYU: Calculate the standard enthalpy of combustion for benzene, C6H6. C6H6() + 15/2 O2(g) 6 CO2(g) + 3...
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The standard enthalpy change for the reaction below is ΔH°rxn = −757 kJ.

 3 SF4 (g)  +  4 BCl3 (g)  →  4 BF3 (g)  +  3 SCl2 (l)  + 3 Cl2 (g)       ΔH°rxn = −757 kJ

Substance

ΔH°f (kJ/mol)

SF4 (g)

–775

BCl3 (g)

–404

BF3 (g)

?

Cl2 (g)

0

SCl2 (l)

–50

 

Use the information provided to calculate the standard enthalpy of formation for BF3 (g).

Answer kJ/mol

 

The reaction shown above is Exothermic or Endothermic

 

How many grams of BCl3 (m.w.=117.17 g/mol) must be reacted with excess SFin order to produce 6000. kJ of energy?

Answer grams

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