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Help with PP1 Chain question

Can someone please help answer the following;

The dominant nuclear reaction in the core of the Sun is the ppI chain:
1 4 + 4H → He + 2e + 2ν + 2γ 1 2 e

This question concerns some of the details of that reaction.
(a) The ppI chain consists of three stages.

(i) Calculate how much energy is released in the stage of the reaction that
produces the neutrinos, using information provided in Table 1. Express
your answer in eV. You can assume the mass of the neutrino is
negligible.

(ii) The entire ppI chain releases 2.67 × 107 eV. Estimate the percentage of
this energy that is carried by the neutrinos. State any assumption you
made in your calculation.

Table 1
Rest masses of particles in the ppI chain.

Particle Mass/10–27 kg
1
1H 1.67 262
2
1H 3.34 358
3
2 He 5.00 823
4
2 He 6.64 466
e
+ 0.00 091

Even some general guidance would be appreciated, I'm completely stuck!

Thanks!
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