Destroyer gen chem question 155

[bustedgrill]

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3COCl2 (g) + B203(s) ---> 2BCl3 (g) + 3CO2(g)

From here he wants us to calculate the enthalpy change for this reaction and gives us delta H values.

What I don't understand is that he includes the B2O3 (s) in the calculation? WTF? Could someone explain? THanks

 

[nze82]

3COCl2 (g) + B203(s) ---> 2BCl3 (g) + 3CO2(g)

From here he wants us to calculate the enthalpy change for this reaction and gives us delta H values.

What I don't understand is that he includes the B2O3 (s) in the calculation? WTF? Could someone explain? THanks

Enthalpy Change = Sum[enthalphy change of products] - Sum[enthalpy change of reactants]

B2O3 is one of the reactants, so I'm not sure why you're surprised that they've included it in their calculation.

 

[dentrilla]

i think you're thinking about equilibrium constants? thats when you leave out anything thats in solid phase

 

[bustedgrill]

My bad I was thinking of lone elements. Thanks.