The mass of unit cell of \( \mathrm{Na}_{2} \mathrm{O} \) is (1) Twice the formula mass of \( \m...

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The mass of unit cell of \( \mathrm{Na}_{2} \mathrm{O} \) is
(1) Twice the formula mass of \( \mathrm{Na}_{2} \mathrm{O} \)
(2) Four times the formula mass of \( \mathrm{Na}_{2} \mathrm{O} \)
(3) Six times the formula mass of \( \mathrm{Na}_{2} \mathrm{O} \)
(4) Thrice the formula mass of \( \mathrm{Na}_{2} \mathrm{O} \)
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