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Chemistry Hess’ Law question
- Thread starter Himani
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PlanetMaster
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Hi Himani, Welcome to XtremePapers (aka XPRS)!
Please post the question in the thread instead of title so we can fully read it.
Please post the question in the thread instead of title so we can fully read it.
The ionic equation for this reaction is shown.
Ca(s) + 2H+(aq) → Ca2+(aq) + H2(g) ∆Ho
= x kJmol–1
Construct a fully labelled Hess’ Law cycle to connect each side of this equation to the
relevant gas phase ions.
Use your cycle, the following data, and data from the Data Booklet, to calculate a value for x.
standard enthalpy of atomisation of Ca(s), (Ca) +178kJmol–1
standard enthalpy of hydration of Ca2+(g), (Ca2+) –1576kJmol–1
standard enthalpy of hydration of H+(g), (H+) –1090kJmol-1
Ca(s) + 2H+(aq) → Ca2+(aq) + H2(g) ∆Ho
= x kJmol–1
Construct a fully labelled Hess’ Law cycle to connect each side of this equation to the
relevant gas phase ions.
Use your cycle, the following data, and data from the Data Booklet, to calculate a value for x.
standard enthalpy of atomisation of Ca(s), (Ca) +178kJmol–1
standard enthalpy of hydration of Ca2+(g), (Ca2+) –1576kJmol–1
standard enthalpy of hydration of H+(g), (H+) –1090kJmol-1