The number of \( \mathrm{F}^{-} \)ions in \( 4.2 \mathrm{~g} \mathr...

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The number of \( \mathrm{F}^{-} \)ions in \( 4.2 \mathrm{~g} \mathrm{AlF}_{3} \) is
\( \mathrm{P} \) \( (\mathrm{Al}=27, \mathrm{~F}=19) \)
(a) 0.05
(b) \( 9.03 \times 10^{22} \)
(c) \( 3.01 \times 10^{22} \)
(d) 0.15
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