Question

What is the percent by mass of titanium in rutile, a mineral that contains titanium and oxygen, if structure can be described as a closed packed array of oxide ions, with titanium in one half of the octahedral holes. What is the oxidation number of titanium?

• A. $\approx 30\%,+4$
• B. $\simeq 60\%,+2$
• C. $\simeq 60\%,+4$
• D. $\simeq 30\%,+2$

Answer 1

Answer: (C)

$\simeq 60\%,+4$

As we know, Rutile is a mineral composed primarily of titanium dioxide, $Ti{O}_2$.
Rutile is the most common natural form of $Ti{O}_2$.
The oxidation number of $Ti=+4$
Percentage mass of $Ti=48\times \frac{100}{80}=60\%$