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[ghostanime2001]

Given:

1. Na(s)  Na(g) ΔH = 109 kJ
2. ΔH^°_diss = 251 kJ for O₂
3. ΔH^°_diss = 435 kJ for H₂
4. ΔH^°_diss = 465 kJ for O--H
5. ΔH^°_diss = 255 kJ for Na--O
6. ΔH_soln = -46 kJ for NaOH_(s)
7. ΔH^°_f = -427 kJ for NaOH_(s)

Predict ΔH for NaOH_(s) NaOH_(g)

Ans: 159 kJ

I understand the standard states of all substances for #1-3 but I am unsure of #6,7. I don't understand what the standard states are for #5,6 (both reactants and products). I don't understand what the physical state of sodium is for #7 (is it solid or gas ?). Also how will the aqueous ions produced from dissociation of sodium hydroxide in #6 cancel out ? 

Thanks!! 

[ghostanime2001]

sorry I meant to say "for #1-3 but I am unsure of #4,5,7. I don't understand what the standard states are for #4,5 (both reactants and products)."

[ghostanime2001]

Any ideas ?

[ghostanime2001]

Any ideas about this question anyone ?