Apatient being treated for thyroid cancer is to receive a dose of iodine-131. the typical dose is 4.5 uci/kg of body weight.
how many microcuries (uci) are administered to a patient weighing 73.0 kg ?

You would need 328.5 uCi.

Explanation:

Since you need 4.5 uCi per kilogram of body weight then you would multiply 4.5 with their body weight in kilograms to get the answer.

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.

the answer is option a.