Find the number of formula units of $F e S O_{4} .7 H_{2} O$ present in 11 millimoles of $F e S O_{4} .7 H_{2} O$ .

0.011 N_{A}

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0.11 N_{A}

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1.1 N_{A}

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11 N_{A}

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Solution

The correct option is A $0.011 N_{A}$
Number of formula units $= n u m b e r o f m o l e s \times N_{A} f o r m u l a u n i t s / m o l$
$11 m i l l i m o l e s = 11 \times 10^{- 3} m o l e s o r 0.011 m o l e s$
Number of formula units $= 0.011 \times N_{A}$

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