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InterviewSolution
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The Q value of a nuclear reaction A+b=C+d is defined by `Q=[m_A+m_b-m_C-m_d]c^2` where the masses refer to the respective nuclei. Determine form the given data the Q value of the following reactions and state whether the reactions are exothermic of endothermic. (i) `._1H^(1)+._1H^3to ._1H^2+._1H^2` (ii) `._6C^(12)+._6C^(12) to ._10Ne^(20)+._2He^4` Atomic masses are given to be `m(._1H^2)=2.014102u , m(._1H^3)=3.016049 u, m(._6C^(12))=12.000000u , m(._10Ne^(20))=19.992439u` |
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Answer» Correct Answer - (i)-4.031 MeV, Endothermic (ii)+4.616 MeV, Exothermic (i)Mass of LHS = 4.023874 u Mass of RHS =4.028204 u Q=[(Mass of LHS-Mass of RHS) u] x 931 MeV Q=-4.031 MeV `rArr` reaction is endothermic (ii)[12.000000+12.000000-(19.992439+4.002603)] x 931 Q=4.616 MeV Q is positive `rArr` reaction is exothermic |
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