For the reaction mgso3(s) → mgo(s) + so2(g), which is spontaneous only at high temperatures, one would predict thata. δh˚ is negative and δs˚ is negativeb. δh˚ is positive and b. δs˚ is negativec. δh˚ is positive and δs˚ is positived. δh˚ is negative and δs˚ is positive

c. ΔH˚ is positive and ΔS˚ is positive

Explanation:

According to Gibb's equation:

= Gibbs free energy  

= enthalpy change

= entropy change  

T = temperature in Kelvin

= +ve, reaction is non spontaneous

= -ve, reaction is spontaneous

= 0, reaction is in equilibrium

Thus for

Case :

>

when both have positive values.

Reaction is spontaneous only at at high temperatures.

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~courtney

it's all four options.