Answer
$Q_1 = 5.98 MeV$
Work Step by Step
For the second reaction,
$^{223}Ra \longrightarrow ^{219}Rn + ^{4}He $
$Q_1 = (m_{Ra} - m_{Rn} - m_{He}) c^2$
$Q_1 = (223.01850u - 219.00948u - 4.00260 u) (931.5 MeV/u) $
$Q_1 = 5.98 MeV$
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