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WAEC Chemistry 2018 Paper

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Question : 32

Total: 50

How many atoms are contained in 0.2moles of nitrogen?

N_{A} = 6.02 \times 10^{23}

$1.20 \times 10^{23}$
$2.41 \times 10^{23}$
$3.62 \times 10^{23}$
$4.82 \times 10^{23}$

Solution:

$1 \text{ mole} = 6.02 \times 10^{23} \text{ atoms}$

$0.2 \text{ moles} = 6.02 \times 10^{23} \times 0.2$ atoms

= $1.204 \times 10^{23}$

$\approx 1.2 \times 10^{23}$

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