Chemistry Practice Problems Hess's Law Practice Problems Solution: Use the following data to calculate the standard h...

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Solution: Use the following data to calculate the standard heat (enthalpy) of formation, ΔH °f, of manganese(IV) oxide, MnO2 (s). 2MnO2 (s) → 2MnO (s) + O2 (g)          ΔH = 264 kJ MnO2 (s) + Mn(s) → 2MnO (s)           ΔH = -240 kJ Select one:(a) -504 kJ (b) -372 kJ (c) 24 kJ (d) -24 kJ (e) 504 kJ

Problem

Use the following data to calculate the standard heat (enthalpy) of formation, ΔH °f, of manganese(IV) oxide, MnO2 (s). 

2MnO(s) → 2MnO (s) + O2 (g)          ΔH = 264 kJ 

MnO2 (s) + Mn(s) → 2MnO (s)           ΔH = -240 kJ 

Select one:

(a) -504 kJ 

(b) -372 kJ 

(c) 24 kJ 

(d) -24 kJ 

(e) 504 kJ


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