b
\({\text{Cr}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{\text{:}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{\text{O}}\)

મોલ \(\frac{{{\text{4}}{\text{.8}} \times {\text{1}}{{\text{0}}^{{\text{10}}}}}}{{6 \times {{10}^{23}}}}\,\,\,:\,\) \(\frac{{9.6 \times {{10}^{10}}}}{{6 \times {{10}^{23}}}}\)

\(\,\,\,1\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,:\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,2\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,Cr{O_2}\)