Chemistry: 1. With the aid of a Hess cycle, determine the enthalpy of the decomposition reaction of sodium nitrate, NaNO3 to sodium nitrite, NaNO2 and oxygen, O2. [5] Enthalpy of formation of NaNO3 = -468 kJ/mol Enthalpy of formation of NaNO2 = -369kJ/mol

1. With the aid of a Hess cycle, determine the

kp2078

10.02.2022

Explanation:

2NaNO₃ = 2NaNO₂ + O₂

NaNO₃ = NaNO₂ + 1/2 O₂

- 468 kJ -369 kJ 0 kJ

enthalpy of decomposition reaction

= - 369 - ( - 468 ) kJ

= 99 kJ / mol .

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14.02.2020

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