If a dose with an activity of 2.55 mCi of 123I is given to a patient for a thyroid test, how much of the 123I will still be active 48 hours later?

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explanation:

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answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

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