The Total solution for NCERT class 6-12
The Q value of anuclear reaction A + b → C + d isdefined by
Q = [ mA+ mb− mC− md]c2 wherethe masses refer to the respective nuclei. Determine from the given datathe Q-value of the following reactions and state whether thereactions are exothermic or endothermic.
(i)
(ii)
Atomic masses are given to be
(i) Thegiven nuclear reaction is:
It is given that:
Atomicmass
Atomic mass
According to the question,the Q-value of the reaction can be written as:
The negativeQ-value of thereaction shows that the reaction is endothermic.
(ii) Thegiven nuclear reaction is:
Atomicmass of
Atomic mass of
The Q-value of thisreaction is given as:
The positive Q-valueof the reaction shows that the reaction is exothermic.