Kayla M.

asked • 10/11/22

what is the answer?

When 0.305 g of sodium metal is added to an excess of hydrochloric acid, 3170 J of heat are produced. What is the enthalpy of the reaction as written?


2Na(s)+2HCl(aq)⟶2NaCl(aq)+H2(g)



Enthalpy of reaction:


Ajinkya J.

As previously mentioned, no steps have been shown in the above question, in case the student, asks to do so, I will make required edits.
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10/11/22

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Ajinkya J. answered • 10/11/22

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ΔH = -3.170 kJ / 0.0133 mole = -238.34 kJ/mol

 

 

ΔH is negative because energy is released by the system.


Now, Since the coefficient of Sodium in the equation is 2, you actually have to double your answer, hence the correct answer is - 476.68 kJ.

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