Đáp án:
a)
\({M_{Mg}} = 4,01797 \times {10^{ - 26}}kg\)
b)
\({M_{Al}} = 4,5202 \times {10^{ - 26}}kg\)
Giải thích các bước giải:
\(\begin{array}{l}
a)\\
{M_{Mg}} = p \times {m_p} + n \times {m_n} + e \times {m_e}\\
\,\,\,\,\,\,\,\,\,\,\, = 12 \times 1,6726 \times {10^{ - 27}} + 12 \times 1,6748 \times {10^{ - 27}} + 12 \times 9,1094 \times {10^{ - 31}}\\
\,\,\,\,\,\,\,\,\,\,\, = 4,01797 \times {10^{ - 26}}kg\\
b)\\
{M_{Al}} = p \times {m_p} + n \times {m_n} + e \times {m_e}\\
\,\,\,\,\,\,\,\,\,\,\, = 13 \times 1,6726 \times {10^{ - 27}} + 14 \times 1,6748 \times {10^{ - 27}} + 13 \times 9,1094 \times {10^{ - 31}}\\
\,\,\,\,\,\,\,\,\,\,\, = 4,5202 \times {10^{ - 26}}kg
\end{array}\)
