yo_wazzup41

Find the lattice enthalpy of MgF2(s) Mg(s) + F2(g) -------- MgF2(s) -1102 kJmol-1 1/2F2(g) -------- F (g) + 79 kJmol-1 F(g) + e- -------- F-(g) -348 kJmol-1 Mg (s) -------- Mg(g) +150 kJmol-1 Mg (s) -------- Mg^2+ (g) + 2e- +2186 kJmol-1 My calculation is : -1102 + 79*2 + 348 *2 - 150 -2186 and my answer is :- 2584 but the modal answer is -2821 can anyone please help me thankx

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acid is used as a catalyst for the reaction between propanone and iodine. what is the purpose of adding sodium hydrogencarbonate too in the reaction? im doing a report and i dont know how to answer this question can anyone help me thanks