Anurse needs 525 g of 2.00 % sterile saline solution (nacl). she has two sterile stock solutions of nacl: 5.000% and 0.5000 % by mass, but no sterile water. how much of the 5.000 % and the 0.5000 % solutions he needs to make the required solution? (a) 150 g of the 5.000 % solution and 375 g of the 0.5000 % solution (b) 175 g of the 5.000 % solution and 350 g of the 0.5000 % solution (c) 185 g of the 5.000 % solution and 340 g of the 0.5000 % solution (d) 200 g of the 5.000 % solution and 325 g of the 0.5000 % solution

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.

the temperature of the gas, in k, not celsius.

the answer is c. nacl