Question

1. A small sample naphthalene is place inside a bomb calorimeter and ignited in the presence of excess O₂(g). The temperature of the bomb increases because of the reaction. What are the signs of dq, dw and dU for the excess O₂(g)?
   1. dq > 0, dw = 0, dU > 0
   2. dq > 0, dw < 0, dU = 0
   3. dq = 0, dw > 0, dU < 0
   4. dq < 0, dw = 0, dU < 0
   5. dq > 0, dw > 0, dU > 0

Answer 1

Naphthalene ( Hg) combustion of Go to Go Hq + 2 o 10co, (8 +44(e) (excess) DHz-ve For Bomb calorimeter, volume is fixed (broz of rigid container/wall). .. dv=0 .: Work – (Pext dy .= 0 Асс Heat & supplied by combustion of rephthalene sample ng to first law of thermodynamics AU = oq towe Ow =0 DU = q qa heat evergy released by combustion DU change in internal energy

→ So we can conclude that heat released due to combustion of pample is absorbed by remain elements or compounds (eg- excess of onggen) so their temperature will increased. whole heat supply used in increase in internal energy of system w=o for micel q = the boz best in reaction negative, bug heat is released boz released heat will be for excess of a absorbed by the dw =o tiv-count) sussoundings .. ou = the daxo (excess of onggen absorbed the duxo heat energy released by combustion of a blog of increase Nephthalene. in temp. of ₂ (excess), its (a) enterud energy increases Aus - - - сrеале
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