13 5
The Q value of a nuclear reaction A + b ® C + d is defined by
Q = [ mA + mb – mC – md]c2
         where the masses refer to the respective nuclei Determine from the
given data the Q-value of the following reactions and state whether
the reactions are exothermic or endothermic (i) 1
3
2
2
1
1
1
1
H+ H
H+ H
→
(ii) 12
12
20
4
6
6
10
2
C+ C
Ne+ He
→
Atomic masses are given to be
m ( 2
m ( 31 H ) = 2