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Find the Q value of the reaction P + .^(...

Find the `Q` value of the reaction `P + .^(7) Li rarr .^(4) He +.^(4) He`. Determine whether the reaction is exothermic or endothermic. The atomic masses of `.^(1) H,.^(4) He` and `.^(7)Li` are `1.007825 u,4.002603 u`, and `7.016004 u`, respectively.

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The total mass of the initial particles
`m_i`=1.007825+7.016004=8.023829 u and the total mass of the final particles
`m_f`= 2 x 4.002603 = 8.005206 u
Difference between initial and final mass of particles
`Deltam=m_i-m_f`=8.023829-8.005206= 0.018623 u
This mass is converted into energy and the reaction is exothermic. The Q value is positive and given by
`Q=(Deltam)c^2`=0.018623 x 931.5 = 17.35 MeV
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