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The mass defect in a particular reaction is 0.4 g. The amount of energy liberated is n 107 kWh, where n= . (speed of light =3 108 m/s)
1
E= m c2=0.4 10-3 (3 108 )2
=3.6 1013 J
1 kWh=3.6 106 J
E= 3.6 10133.6 106 kWh=1 107 kWh
n=1
Answer: 1
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