Identify what kind of ligand (weak or strong), what kind of wavelength (long or short), what kind of spin (high spin or low spin) and whether it is paramagnetic or diamagnetic for the following complexes. a. [Co(NH3)6]3+
b. [Rh(en)3]2+
c. [Fe(NO2)6]3-

See explanation

Explanation:

Whether a ligand is strong or weak highly depends on its position in the spectrochemical series. Ligands that are found towards the left hand side of the series are weak field ligands while ions that occur towards the right hand side of the series are strong field ligands. The spectrochemical series is an arrangement of ligands in order of increasing magnitude of crystal field splitting.

Most of the strong field ligands have strong pi bonds and are capable producing greater crystal field splitting.

NH3, an and NO2 are all strong field ligands hence they produce long wavelengths and lead to the formation of diamagnetic complexes.

answer : third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

explanation :

let us write down the given equations

equation 1 :

equation 2 :

equation 3 :

let us use hess's law to find out which 2 equations can be added to get the third equation.

let us reverse equation 2 and multiply it by 2. the new equation that we get is,

equation 4 :

let us add equation 1 & 4

the above equation is similar to equation 3 but has different value for dhrxn.

therefore third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol