The distance between any two successive places where the shape of the wave repeats itself a: wave b: wave length c: hertz d: decibel

B: wavelength

Explanation:

A wavelength (λ) is the distance between any two successive places where the shape of the wave repeats itself.

It can be the distance between

The wave is all these repeating units joined together in sequence.

A hertz is a unit of frequency, and a decibel is a measure of the loudness of a sound wave.

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.