For a certain compound MX , the lattice energy is − 1220 KJ / mol . If the heat of hydration of the cation is 1.5 times that of the anion, what is the heat of hydration of the M + ion? Δ H = − 90 KJ /

Question

For a certain compound MX , the lattice energy is − 1220 KJ / mol . If the heat of hydration of the cation is 1.5 times that of the anion, what is the heat of hydration of the M + ion? Δ H = − 90 KJ / mol . Express your answer only in magnitude

TestHub · Accepted Answer

Hydration energy of M + = 1.5 × hydration energy of X − Δ H soln ​ = LE + 1.5 X − + X − = LE + 2.5 X − = − 90 kJ / mol = 1220 kJ / mol + 2.5 X − X − = − 524 M + = 15 H − = 1.5 × ( − 524 ) = − 786 kJ / mol

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