Ok, normally I would have spilled my beans without even thinking, but I'm attempting to at least try and follow the sites rules of not doing the homework for people, so I had to ask
Anyway, I've never really thought of syllabification in PIE, I'm usually far more concerned with morphemes:
(1) *h₂rnbʰi;
*h₃ṛ-n-bʰí (instrumental plural), from *h₃ér-ō m. "eagle" (by Szemerényi's law from *h₃ér-on-s); from *h₃er- "eagle";
(2) *h₂erh₃trom;
*h₂érh₃-tr-om n. "plough"; from *h₂erh₃- "to plough", *-ter- (Ø-grade *-tr-) (agentive suffix);
(3) *k̂mtom;
*d-k̂ṃt-óm n. "hundred"; perhaps from *dék̂ṃt "ten"
(4) *h₂iuHon;
*h₂iwh₁-n-k̂-ós ad. "young"; from *h₂ey-w- "life force, vitality;
(5) *h₂sntieh₂;
*h₁s-ṇt-yéh₂ f. "sin, crime"; from *h₁s-ónt- (present participle) "being, existing; truly; guilty"; from *h₁es- (Ø-grade *h₁s-) "to be", *-ont- (present participle, agentive suffix);
(6) *ĝʰēimno-;
*ĝʰḗy-mṇ (by Szemerényi's law from *ĝʰéy-mṇ-s) m. "winter"; from *ĝʰéy- "winter; snow", *-men- (Ø-grade *-mn-) (action noun, result noun suffix);
As for their syllabification, perhaps:
(1) *h₃ṛn-bʰí
(2) *h₂ér-h₃tr-om
(3) *dk̂ṃt-óm
(4) *h₂iw-h₁nk̂-ós
(5) *h₁-sṇt-yéh₂
(6) *ĝʰḗy-mṇ
I am by no means an expert, so do not take these as absolute reconstructions, I may have made several mistakes
