» Identify the mass of a substance of the given number of moles using the formula.
[tex] \: : \implies \sf \large mass = moles \times molar \: mass \\\\[/tex]
» Find the molar mass of carbon monoxide (CO)
[tex] \begin{array}{ccccc} \tt1 \times C& = & \tt 1(12g/mol) & = & \tt 12g/mol \\\tt1 \times O& = & \tt 1(16g/mol) & = & \tt \underline{ \: 16g/mol \: } \\ &&&&\tt28g/mol\end{array}\\\\[/tex]
» Substitute the given number of moles and the molar mass of CO to the formula.
[tex] \implies \sf \large mass = 5.5 \: mol \times 28g \tt/ \sf mol[/tex]
[tex]\implies \sf \large mass = 154g\\\\[/tex]
» The nearest choice is Letter A (155g) so...
[tex] \tt \huge » \: \purple{A. \: 155g}[/tex]
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