Bond breaking is an endothermic change and bond forming is an exothermic change. Bond energy is the amount of energy in kJ/mol needed to break one mole of the specified bor
H
H
H
H
H
H
H
C
.C
H
CI
H
0 0 0 0
HCI
H
H
H
H
H
H
Use the following bond energies to determine whether this reaction is exothermic or
endothermic. You must show your reasoning.
bond
bond energies in
KJ/mol
CCI
338
CH
412
CH
CI-CI
242
H-CI
431
348
I

Aconductor easily transfer heat

C. control over the business

  the volume of  0.220 m k2s    solution  required  to  completely  react with 175 ml  of 0.115m co(no3)2  calculate the moles  of co(no3)2 =  molarity x volume/1000175 x0.115/1000= 0.02  moleswrite  the reacting  equationk2s(aq)  +  co(no3)2  = 2 kno3(aq)  + cos(s)by  use  of mole ratio between k2s to co(no3)2 which  is  1: 1 the moles of k2s is therefore = 175  x0.115/1000= 0.02  molesvolume = moles/molarity=0.02/0.22=0.09  ml  of k2s

Nddhjddjfoowowoowjjfc