Đáp án:
$28,049$ %
Giải thích các bước giải:
%$m_{Na}=\dfrac{M_{Na}}{2M_{C}+3M_{H}+2M_{O}+M_{Na}}.100=$ $\dfrac{23}{12.2+3.1+16.2+23}.100$ $=\dfrac{23}{82}.100=28,049$ %
Giải:
`%m_{Na} = 23/(12 + 3 + 12 + 16 + 16 + 23) . 100% = 23/82 .100% ≈ 28,049%`
Giải thích:
`%m_A = (x.M_A)/(M_{hh)) . 100` `%`
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