Answer
$3.40$ KJ
Work Step by Step
Average Kinetic energy per mole can be determined as:
$K.E \times N_{a}=5.65\times10^{-21}\times6.023\times10^{23}$
$K.E \times N_{a}=3402$
$K.E \times N_{a}=3.4\times10^{3}$
$K.E \times N_{a}=3.4KJ$
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