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12. Use the average enthalpy change, DH, you determined from this experiment to predict the amount of heat that should b...

12. Use the average enthalpy change, DH, you determined from this experiment to predict the amount of heat that should be released when 4.00 mol Mg reacts with excess HCl. Use correct significant figures.

2HCl+MG->H2+MgCl2

DHaverage (kJ/mol)  

-478kJ
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Answer #1

2HCl + Mg   ----> H2 + MgCl2    ; DHavg = -478 kj/mol

No of mol of Mg reacted = 4.00 ml

from the equation, 1 mol Mg gives 478 kj energy.

Hence, Amount of heat released(q) = 4*478 = 1912 kj

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