Question

Consider the following carbonyl complex compounds.

(i) $Mo(CO{)}_x$ (ii) $H_y\left[Cr\right(CO{)}_5]$ (iii) $R{u}_3(CO{)}_z$

Then calculate value of $|z+y–x|$.

Answer 1

The carbonyls in general obey the effective atomic number rule and their effective atomic number = atomic number of next noble gas

(i) $Mo(CO{)}_x\Rightarrow$ EAN of Molybdenum is '54'

$42+2x=54$

$x=6$

(ii) $H_y\left[Cr\right(CO{)}_5]\Rightarrow$ EAN of Chromium is '36'

$24+(2\times 5)+y=36$

$y=2$

(iii) $R{u}_3(CO{)}_z\Rightarrow$ EAN of each Ruthenium is '54'

$44+2$ (from other Ru-atoms)$+2z_1=54$

$z_1=4$

$z=3z_1=12$

Then $z+y-x=12+2-6=8$