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Q.

The number of moles of sodium oxide in $620 g$ of it is

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a

$100 moles$

b

$1 mol$

c

$10 moles$

d

$18 moles$

answer is B.

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Detailed Solution

Sodium oxide $\to {Na}_{2} O$

Molecular weight $= 46 + 16 = 62$

$62 gm$ of ${Na}_{2} O = 1$ mole

$620 gm$ of ${Na}_{2} O = 10$ mole

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