Suppose you have a calorimeter that contains 100.0 grams of water at an initial

Question

Suppose you have a calorimeter that contains 100.0 grams of water at an initial temperature of 25 degree C. A salt (2.19 g, 0.020 moles) is dissolved in the water, and the final temperature is 29 degree C. Calculate the standard heat of solution (on a per mole basis). Was the dissolution exothermic or endothermic? The H degree_f is defined as "the enthalpy change for the formation of one mole of a substance from its elements in their standard states." For example, the heat of formation, Delta H degree_f of CO_2 is C(graphite) + O_2(g) rightarrow CO_2(g). Note that we use carbon in the form of graphite since this is the standard state for carbon, and diatomic oxygen, since this is the standard state for oxygen. Write the chemical reaction that correlates to the Delta H degree_f of KCl_(f).

Explanation / Answer

2)

K (s) + 1/2 Cl2 (g)   ------------> KCl (s)

Explanation :

KCl is formed from its elements potassium (K) and chlorine gas (Cl2).

the standard state of potassium = solid , K (s)

standard state of Chlorine = gas (Cl2)

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