[tex]\qquad \qquad\huge \underline{\boxed{\sf Answer}}[/tex]
Here's the solution ~
[tex]\qquad \sf \dashrightarrow \: 1 \: mole = 98 \: g[/tex]
[tex]\qquad \sf \dashrightarrow \: 7 \: moles =7 \times 98 \: g[/tex]
[tex]\qquad \sf \dashrightarrow \: 7 \: moles = 686 \: g[/tex]
Therefore, the correct option is C
