Anurse practitioner prepares an injection of promethazine, an antihistamine used to treat allergic rhinitis. if the stock bottle is labeled 25 mg/ml and the order is a dose of 14.5 mg , how many milliliters will the nurse draw up in the syringe?

Answer : 0.58 mL will the nurse draw up in the syringe.

Explanation :

As we are given that the stock bottle labelled 25 mg/mL. Now we have to calculate the amount will nurse draw up in the syringe.

As, 25 mg dose present in = 1 mL

and, 1 mg dose present in =

So, 14.5 mg dose present in =

                                               = 0.58 mL

Therefore, 0.58 mL will the nurse draw up in the syringe.

answer: the enthalpy of the overall chemical reaction is +87.88 kj or +88 kj.

according to hess's law, the overall enthalpy of a reaction is the difference between the sum of enthalpy values of all the products and the sum of enthalpy values of all the reactants.

δh(reaction) = ∑nδh(products) - ∑nδh(reactants)

δh(reaction) = [δh +δh] - [δh]

δh(reaction) = [1(-287.02) + 1(0) ] - [1(-374.9)] kj = +87.88 kj

here, δh (pcl3) = -287.02 kj, δh(cl2) = 0, δh(pcl5) = -374.9 kj

therefore, enthalpy of the overall reaction is +87.88 kj or +88 kj.

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