Question

Sodium carbonate can be made by heating sodium bicarbonate: 2NaHCO3(s) → Na2CO3(s) + CO2(g) + H2O(g) Given that ΔH° = 128.9 kJ/mol and ΔG° = 33.1 kJ/mol at 25°C, above what minimum temperature will the reaction become spontaneous under standard state condi

Answer 1

[tex]128^{o}C[/tex]minimum temperature will the reaction become spontaneous.

Step-by-step explanation:

`\Delta G=\Delta H-T \Delta S`

From the given,

`\Delta G^(o)=33.1`

`\Delta H^(o)=128.9kJ/mol`

`Temperature\,change=25+273=98K`

`33.1=128.9-298 \Delta S`

`\Delta S=0.322kJ/mol.K`

`\Delta G=\Delta H-T \Delta S`

`0=128.9-T(0.322)=401K=218^(o)C`

Therefore,
`128^(o)C`minimum temperature will the reaction become spontaneous.