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Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: GreenAssailant on December 10, 2011, 09:41:15 PM

Title: [CHMA] Standard Enthalpies of Formation (Clarification)
Post by: GreenAssailant on December 10, 2011, 09:41:15 PM

The standard enthalpy of formation for MgSO4?

Attempt:
Mg(s) + 1/8 S8(g) + 2 O2(g) --> MgSO4

However, I am not sure if the bold part is correct. What is the uncombined form of sulphur?

Title: Re: [CHMA] Standard Enthalpies of Formation (Clarification)
Post by: Borek on December 11, 2011, 04:22:42 AM

S₈, even if it is not uncommon to balance reactions and do the calculations as if it was just S.

But I don't think it will be still S₈ in gaseous form.