What is the balanced equation for the reaction of, Hydrogen cyanide from ammonia and methane gas...

What is the balanced equation for the reaction of, Hydrogen cyanide from ammonia and methane gas (Degussa process) CH4(g) + NH3(g) -> HCN (g) + 3 H2(g)? Determine the ΔH, ΔS, and ΔG at 298 K.

Solutions

Expert Solution

reactants = ammonia + methane

products = Hydrogen cyanide

So...

ammonia = NH3

methane = CH4

products --> HCN

clearly, there must be H2 leftover so:

CH4 + NH3 → HCN + 3 H2

now...

dHRxn = Hproducts - Hreactants

dHRxn = HCN + 3*H2 - (CH4 + NH3) = (130.5 + 3*0) - (-73.4 -45.6) = 249.5 kJ/mol

dSRxn = Sproducts - Sreactants

dSRxn = HCN + 3*H2 - (CH4 + NH3) = (201.7 + 3*130.5) - (186.2 + 192.5) = 214.5 J/K = 0.2145 kJ/K

dGRxn = dHrxn - T*dSrxn

dGrxn = 249.5 - 298 * 0.2145 = 185.579 kJ/mol

queen_honey_blossom answered 1 year ago

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