Question
Calculate the molecular mass of Na2CO3.
Answer: Option D
:
D
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:
D
Molecular mass of a compound is equal to the sum of the masses of its constituent atoms. The atomic mass of sodium, carbon and oxygen are 23u, 12u and 16u respectively.
Therefore, the molecular mass of Na2CO3
=(2×atomic mass of Na) + (1×atomic mass of C) + (3×atomic mass of O)
=(2×23)+(1×12)+(3×16)
=46+12+48=106 u.
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