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Enthalpy of Formation - Semantics
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Topic: Enthalpy of Formation - Semantics (Read 1627 times)
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intex
Very New Member
Posts: 2
Mole Snacks: +0/-0
Enthalpy of Formation - Semantics
«
on:
March 29, 2014, 09:03:15 PM »
Hello everyone!
I am having a little trouble fully understanding the semantics of this question. For this answer I believe the answer is (B) - as oxygen gas exists as O
2
not O. However does the (298K) on the Δ
f
H
o
(298 K) relate to both the reactants and products as referred to in answer D?
Which statement is INCORRECT concerning the Δ
f
H
o
(298 K)for MgO(s).
(A)Δ
f
H
o
(298 K)refers to a reaction which produces 1 mol of MgO(s).
(B)Δ
f
H
o
(298 K)refers to a reaction which uses O(g) and Mg(s) as reactants.
(C)Δ
f
H
o
(298 K)refers to a reaction in which both reactants and products are at standard
pressure.
(D)Δ
f
H
o
(298 K)refers to a reaction in which both reactants and products are at298 K
Thanks!
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mjc123
Chemist
Sr. Member
Posts: 2074
Mole Snacks: +302/-12
Re: Enthalpy of Formation - Semantics
«
Reply #1 on:
April 03, 2014, 08:41:56 AM »
Yes, you are right, B is incorrect for the reason you give. And D is correct, both reactants and products are at 298K.
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