Denise combines 0.2 g of Mg metal with HCl and gets a final V of 234 mL which completely reacts (Mg + HCl = MgCl2 + H2). Tsolution changes from 23.8 degrees C to 33 degrees C. The solution's density is 1 g/mL and Cs,H2O = 4.18 J/g degrees C. What is qrxn?

Chemistry: Principles and Practice
3rd Edition
ISBN:9780534420123
Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Chapter5: Thermochemistry
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Problem 5.61QE: When 7.11 g NH4NO3 is added to 100 mL water, the temperature of the calorimeter contents decreases...
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Denise combines 0.2 g of Mg metal with HCl and gets a final V of 234 mL which completely reacts (Mg + HCl = MgCl+ H2). Tsolution changes from 23.8 degrees C to 33 degrees C. The solution's density is 1 g/mL and Cs,H2O = 4.18 J/g degrees C. What is qrxn?

 

Given the following:

Cgr + O2 =  CO2      ΔH = -0.394 J

Cdi + O2 = CO2       ΔH = -0.396 J

What is the ΔH of the conversion of graphite (Cgr) to diamond (Cdi)?

 

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