a. Draw an enthalpy (Hesss law) cycle to show the dissolving of magnesium iodide in water. b.

Question:

a. Draw an enthalpy (Hess’s law) cycle to show the dissolving of magnesium iodide in water.

b. The table shows the values for all but one of the enthalpy changes relevant to this cycle.

i. Define enthalpy change of hydration.

ii. Use the values in the table to calculate the value for the enthalpy change of solution of magnesium iodide.

c. Draw a diagram to show how water molecules are arranged around a magnesium ion.

d. Explain why the enthalpy change of hydration of a magnesium ion is more exothermic than the enthalpy change of hydration of a sodium ion.

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Cambridge International AS And A Level Chemistry Coursebook

ISBN: 9781316637739

2nd Edition

Authors: Lawrie Ryan, Roger Norris

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Question Posted: Sep 22, 2021 02:37 AM

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a. Draw an enthalpy (Hesss law) cycle to show the dissolving of magnesium iodide in water. b.

Question:

Enthalpy change Value/kJ mol-1 lattice energy -2327 enthalpy change of hydration of Mg2 ion -1920 enthalpy change of hydration of I- ion -314

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1Hydration enthalpy HHyd is the change in enthalpy when one mole of gaseous ion un...View the full answer

Cambridge International AS And A Level Chemistry Coursebook

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