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Moles of Na2CO3=5.3/106=0.05
so moles of Na=0.05×2=0.1
moles of C=0.05×1=0.05
moles of O=0.05×3=0.15
we can now find the no. of atoms of each type by multiplying the no. of moles by Avagadro's constant.
Hope it helps:-)
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