Consider the following reactions. (1) n + 21H ? 31H (2) 11H + 21H ? 32He (a) Com

Question

Consider the following reactions.
(1) n + 21H ? 31H

(2) 11H + 21H ? 32He
(a) Compute the Q values for these reactions. Identify whether each reaction is exothermic or endothermic. (The mass of a neutron is 1.008665 u, the mass of 11H is 1.007825 u, the mass of 21H (deuterium) is 2.014102 u, the mass of 31H (tritium) is 3.016049 u, and the mass of 32He (helium-3) is 3.016029 u. 1 u = 931.5 MeV.)

(To avoid rounding error in part (c), enter your answers to four significant figures.)
(1) Q = 6.258 MeV




(2) Q = 5.494 MeV


(c) Assuming the difference is primarily due to the work done by the electric force, calculate the distance between the two protons in helium-3. (Treat the protons as point charges.)

?????? m

Explanation / Answer

W= Energy stored= Kq^2/r

5.494*1.602×1019 J= 9*10^9* (1.6*10^-19)^2/r

r=2.62*10^-10m

r= 2.62 angstrom

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