Em tham khảo nha :
\(\begin{array}{l}
a)\\
{M_P} = 15 + 16 = 31dvC\\
1dvC = 1,6605 \times {10^{ - 24}}g\\
{m_P} = 31 \times 1,6605 \times {10^{ - 24}} = 5,14755 \times {10^{ - 23}}g\\
b)\\
{m_P} = 15 \times 1,6726 \times {10^{ - 24}} + 15 \times 9,1094 \times {10^{ - 28}} + 16 \times 1,6748 \times {10^{ - 24}}\\
{m_P} = 5,1899 \times {10^{ - 23}}g
\end{array}\)