Answer to Question #276768 in Chemistry for michelle

Question #276768

For which one of the following substances is the standard enthalpy of formation equal to

zero

Pb(l)
H₂O(l)
CO₂(s)
CO(l)
H₂O(g)

Expert's answer

Solution:

A pure element in its standard state has a standard enthalpy of formation of zero.

Thus, this is Pb(l)

Answer: "1. Pb(l)"

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