Answer to Question #276768 in Chemistry for michelle

Question

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

zero

1. Pb(l)
2. H₂O(l)
3. CO₂(s)
4. CO(l)
5. H₂O(g)

Answer 1

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)"