Which of the following combinations of quantum numbers (n, l, ml, ms) do not represent permissible solutions of the schrodinger equation for the electron in the hydrogen atom?
a) 9, 7, -4, 1/2
b) 8,2, 2, 1/2
c) 6, -5, -1, 1/2
d) 6, 5,-5, 1/2
e) all of the above

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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