Bicycle frames are often made from an alloy of titanium to ensure they are both strong and lightweight. A specific bicycle frame has a total mass of 1.80 kg1.80\text{ kg}1.80 kg. The table below shows the mass of each element present in this frame: \ | Element | Mass in kg\text{kg}kg | | :--- | :--- | | Titanium | 1.62 | | Aluminium | 0.11 | | Vanadium | 0.07 | \
Calculate the percentage by mass of titanium in this frame.
Explain why a titanium alloy is used instead of pure titanium to make bicycle frames.