Verified answer

carbon trifluoride

1 C, 3 F

CF3

trisulfur dichloride

3 S, 2 Cl

S3Cl2

nitrogen trichloride

1 N, 3 Cl

NCl3

sulfur trioxide

1 S, 3 O

SO3

diselenium hexasulfide

2 Se, 6 S

Se2S6

CF3

S3Cl2

NCl3

SO3

Se2S6

The prefix to the element shows how many there are.

Di=2 Tri=3 Tetra=4 Penta=5 Hexa=6 Hepta=7 Octa=8 Nona=9 Deca=10

Using the ^ for subscripts made the formulas look overly crowded and complicated so I removed them. Every number that you see is a subscript. Also, #s 4 and 15 are the same... 1. N2 2.SnS 3. Hg2S 4. HCN 5. FeAsO4 6. Sr(HS)2 7. HFO 8.Al(BiO3)3 9. PbS 10. HBr 11. Al(BrO4)3 12. Ga2(Cr2O7)3 13. Au2(C2O4)3 14. HIO2 15. HCN 16. MgCr2O7 17. Ca(HSO4)2 18. P4O10 19. Sn(NO3)2 20. H3BO3

mono=1, di=2, tri=3, tetra=4, penta=5, hexa=6, hepta=7, octa=8, nona=9, deca=10.

Carbon trifluoride=CF3

trisulfur dichloride=S3Cl2

nitrogen trichloride=NCl3

Sulfur trioxide=SO3

diselenium hexasulfide=Se2S6

you can use the name to help you figure it out:

carbon Fluoride means CF3 because there's one carbon and three (tri) fluoride

trisulfur dicloride means: S3Cl2 because tri means three and di means two.

what do you think nitrogen trichloride means?

NCl3

sulfur trioxide is SO3

diselenium hexasulfide is Se2S6 because hexa is a prefix for 'six'

hope this helps!

CF3

S3Cl2

NCl3

SO3

Se2S6