Question

Why is ΔHf for O2 equal to zero?

A. O2 is already in its standard state.
B. It takes a finite amount of energy to form one mole of substance.
C. It takes a finite amount of energy to produce O2.
D. Its internal energy is not equal to zero.

Answer 1

@JFraser B right??

Answer 2

it's not B

Answer 3

wait really? I'm pretty sure it's either A or B....

Answer 4

all elements in their standard states have \(\Delta H = 0\)

Answer 5

by definition

Answer 6

Oh so it's D?

Answer 7

its not D either

Answer 8

Oh so then it's A?

Answer 9

all elements in their standard states have \( \Delta H = 0\)

Answer 10

So I'm right? I just need confirmation that it's A...

Answer 11

it is A

Answer 12

ok thanks for explaining it! :)