Consider the following example. Using information from the SQA Data Booklet and the fact that silver (l) nitrate and nitrogen dioxide have S° values of 142 and 241 JK-1 mol:-1 respectively, calculate the standard entropy change, for the decomposition of ∆S°, silver(I) nitrate: 2AgNO3(s) 2Ag(s) + 2N02(g) + O2(g) → By substituting in the expression = S° (products) - S°(reactants), we obtain: ∆S° ∑ ∑ = [2(43) + 2(241) + (205)] - [2(142)] = +489 JK-1 mol -1 ∆S°
Consider the following example. Using information from the SQA Data Booklet and the fact that silver (l) nitrate and nitrogen dioxide have S° values of 142 and 241 JK-1 mol:-1 respectively, calculate the standard entropy change, ∆S°, for the decomposition of silver(I) nitrate: 2AgNO3(s) → 2Ag(s) + 2N02(g) + O2(g) By substituting in the expression ∆S° = ∑ S° (products) - ∑ S°(reactants), we obtain: ∆S° = [2(43) + 2(241) + (205)] - [2(142)] = +489 JK-1 mol -1
ReactionFeasibility-Jan.docx