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Pyetja

Sa është entalpia standarde për reaksionin:

$$ 2\text{NaHCO}_3(\text{ng}) \rightarrow \text{Na}_2\text{CO}_3(\text{ng}) + \text{CO}_2(\text{g}) + \text{H}_2\text{O}(\text{l}) $$

duke ditur që entalpitë standarde të formimit janë:

$\Delta H^\circ_{\text{NaHCO}_3(\text{ng})} = -950.8\ \text{kJ·mol}^{-1}$,

$\Delta H^\circ_{\text{Na}_2\text{CO}_3(\text{ng})} = -1130.7\ \text{kJ·mol}^{-1}$,

$\Delta H^\circ_{\text{H}_2\text{O}(\text{l})} = -285.8\ \text{kJ·mol}^{-1}$,

$\Delta H^\circ_{\text{CO}_2(\text{g})} = -393.5\ \text{kJ·mol}^{-1}$.

A) −951 kJ·mol⁻¹

B) +951 kJ·mol⁻¹

C) −91.6 kJ·mol⁻¹

D) +91.6 kJ·mol⁻¹

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