in this equation...
5C + 2SO2 → CS2 + 4CO
How many moles of CS2 form when 2.7 mol C reacts?

in this equation...
5C + 2SO2 → CS2 + 4CO
How many moles of CS2 form when 2.7 mol C reacts?
5:1 Ratio of C:CS2

1:1/5 Ratio of C:CS2

2.7: 2.7*1/5

=2.7/5 = 0.54mol

This is with 100% yield you would normally expect a lower value in the real world. But this is what you would theoretically obtain