Calculating with Bond Energy - A
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Problem
In the problem below, X, Y, and Z represent the symbols of three unknown elements.
The following list gives the bond strengths of three diatomic molecules associated
with the unknown elements X, Y, and Z at 25 degrees C:
X2 = 74.0 kcal/mole
Y2 = 77.0 kcal/mole
XY = 87.0 kcal/mole.
Based on this bond strength information, calculate the value of Q in the following
thermochemical equation:
2 XY (g) ---> X2 (g) + Y2 (g) Q = ? kcal @ 25 degrees C
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