Chemical Thermodynamics Question 443

Question: Values of heats of formation for SiO2 and MgO are 48.4 and 34.7,kJ respectively. The heat of the reaction 2Mg+SiO22MgO+Si is

Options:

A) 21.16,kJ

B) 21.10,kJ

C) 13.62,kJ

D) 13.6,kJ

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Answer:

Correct Answer: B

Solution:

  • ΔH(reaction)=2ΔHf0,(MgO)=ΔHf0,(SiO2)

=2,(,34.7)(,48.4)=21,kJ.



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