Q11. the three hydrides, HCI, HF and CH4 are placed in order of increasing boiling point (from left to right), which of the following is correct?
A-CH4, HF, HCI
B-HF, CH4, HCI
C-CH4, HCI, HF
D-HCI, CH4 HF

A. CH4 , HF , HCl

Explanation:

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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.