It is clear that the core is subject to change
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Explanation:
The structure of Ferrarrisite Ca5(HAs O4)2(AsO4)2
Q = mct
-Q= energy in Joules
-m = mass in grams
-c= specific heat capacity in J/g degree C
-t = delta temperature in degrees Celsius
So,
Q = m c t
Q = (7 grams)(0.448J/g C)(750 C - 25 C)
Q = 2273.6 J
Your final answer = 2273.6 Joules
The accepted model of the atom was changed.