Class 12 Biology Cell: Structure and Functions Nuclei
The Q value of a nuclear reaction, A + b C + d, is defined by
Q\, =\, \left [ m_A\, +\, m_b\, \right ] - \left  [\, m_C\, +\, m_d\, \right ]
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)
(ii)
Atomic masses are given to be

Solution: (i)
Q\, =\, \left [ m_{^1_1H}\, +\, m_{^3_1H}\, \right ] - \left  [\, m_{^2_1}\, +\, m_{^2_1H}\, \right ]

u
Since, Q is negative, some mass is converted into energy. Hence, the reaction is endothermic.

(ii)
Q\, =\, \left [ m_{^{12}_6C}\, +\, m_{^{12}_6C}\, \right ] - \left  [\, m_{^{20}_{10}Ne}\, +\, m_{^4_2He}\, \right ]

u
Since, Q is positive, some mass is converted into energy. Hence, the reaction is exothermic. Connecting you to a tutor in 60 seconds.
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cell cycle and cell division
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