The remaining moles of C is 5.01 moles while the remaining moles of Fâ‚‚ is 0.
The reaction between carbon and Fluorine is given as;
C + 2Fâ‚‚ Â -------> CFâ‚„
1 Â : Â Â 2 Â Â Â Â Â Â Â Â 1
from the reaction above,
2 moles of Fâ‚‚ requires 1 mole of C
7.88 mole of  F₂ will require:   7.88/2 = 3.94 moles of C and 3.94 moles of CF₄.
The remaining moles of C = 8.95 - 3.94 = 5.01 moles while the remaining moles of Fâ‚‚ is 0.
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