Find the number of moles of oxygen atoms present in 1-2 - 1026 atoms of oxygen- Given- NA - 6 - 1023

If the total number of electrons present in a pure sample of $F e S O_{4} . 7 H_{2} O$ is $4.336 \times 10^{26}$
then the total number of moles of oxygen atoms present in $F e S O_{4} .7 H_{2} O$ :

Q. Find the number of electrons present in a pure sample of

M g S O_{4} .7 H_{2} O

containing 5.5 moles of oxygen atoms?
(Take Avogadro's number

(N_{A}) = 6 \times 10^{23}

)

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Find the number of moles of oxygen atoms present in 1.2×1026 atoms of oxygen. (Given: NA=6×1023)

The correct option is A 200Number of moles=Number of atomsAvogadro number=1.2×10266×1023 =200 moles.

Find the number of moles of oxygen atoms present in $1.2 \times 10^{26}$ atoms of oxygen. (Given: $N_{A} = 6 \times 10^{23}$ )

The correct option is A $200$
$Number of moles = \frac{Number of atoms}{Avogadro number} = \frac{1.2 \times 10^{26}}{6 \times 10^{23}}$
$= 200 moles$ .