Chemistry Practice Problems Endothermic & Exothermic Reactions Practice Problems Solution: Which produces more heat, Os(s) + 2O2(g) ⟶ OsO4(s)...

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Solution: Which produces more heat, Os(s) + 2O2(g) ⟶ OsO4(s) or Os(s) + 2O2(g) ⟶ OsO4(g)? For the phase change OsO4(s) ⟶ OsO4(g),    ΔH = 56.4 kJ

Problem

Which produces more heat, 

Os(s) + 2O2(g) ⟶ OsO4(s) 

or 

Os(s) + 2O2(g) ⟶ OsO4(g)? 

For the phase change OsO4(s) ⟶ OsO4(g),    ΔH = 56.4 kJ

Solution

Rxn 1: Os(s) + 2O2(g) ⟶ OsO4(s)

Rxn2: Os(s) + 2O2(g) ⟶ OsO4(g)


Comparing the two equations, we can see that the only difference is the state of products. We have a solid for Rxn 1 and gas for Rxn 2.

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