NDA 2018 Chemistry question

What is the formula mass of anhydrous sodium carbonate? (Given that the atomic masses of sodium, carbon and oxygen are 23 u, 12 u and 16 u respectively)

(A)286 u
(B)106 uCorrect
(C)83 u
(D)53 u

Answer: (B)

Solution

Anhydrous sodium carbonate is . Formula mass $= 2(23) + 12 + 3(16) = 46 +

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Question ID VK-031156