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Hydrogen Fuel

Combustion Reaction and Enthalpy Change

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It burns it burns

Combustion Reaction for Hydrogen:
2H2(g) + O2(g) 2H2O(g)  + Energy                       H =  ? 
Reaction for the Decomposition of Water/Forming of Hydrogen:

2H2O(g) + Energy –> 2H2(g) + O2(g)                   H =  ?

Enthalpy Change for the Combustion of Hydrogen:

Hc =  nHP - nHR

Hc = (2 mol * -241.8 kj/mol) - (2 mol * 0 kj/mol + 1 mol * 0 kj/mol)

Hc = -483.6kj

H = H/n

H = -483.8 kj/2 mol

H= -241.8 kj/mol

HCH = nH

HCH = 2 mol * -241.8 kj/mol

HCH = -483.6 kj

fuelcell.jpg

A fuel cell that burns hydrogen.