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What is the formula mass of anhydrous sodium carbonate?

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What is the formula mass of anhydrous sodium carbonate?

(Given, that the atomic masses of sodium, carbon and oxygen are 23u, 12u and 16u respectively).

(a) 286 u

(b) 106 u

(c) 83 u

(d) 53 u

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(b) 106 u

Chemical formula of (anhydrous) sodium carbonate

= Na2CO3

∴ Formula unit mass of Na2CO3 = (2 x 23 + 12 + 16 x 3)u 

= 106u

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