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Ohh well thank you soo much ..3H is an isotope of hydrogen which has 2 neutrons...the same no as 4He
But I attached the wrong equation paper u see .. Sorry ..
My question was this
papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Biology%20(9700)/9700_s11_qp_12.pdf