Question

Find the total number of oxygen atoms in $5\times {10}^6$ formula units of the complex $\left[Co\right(H_{2}O{)}_6]C{l}_2.$

• A. $4.2\times {10}^7$
• B. $6\times {10}^6$
• C. $3\times {10}^7$
• D. $1.8\times {10}^7$

Answer 1

The correct option is C $3\times {10}^7$

Number of O - atoms present in one formula unit of $\left[Co\right(H_{2}O{)}_6]C{l}_2=6$
Number of O - atoms present in $5\times {10}^6$ formula units of $\left[Co\right(H_{2}O{)}_6]C{l}_2$ are
$=5\times 6\times {10}^6$
$=3\times {10}^7$ atoms