This is the chemical formula for nickel tetracarbonyl (a powerfully poisonous liquid used in nickel refining):
\[
\mathrm{Ni}(\mathrm{CO})_{4}
\]
A chemical engineer has determined by measurements that there are 7.145 moles of nickel in a sample of nickel tetracarbonyl. How many moles of oxygen are in the sample?
Be sure your answer has the correct number of significant digits.
\( \square \) mol \( \square \)
\[
100
\]