The molecular mass of x is 106. x can be

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SO₃

CaCO₃

Na₂CO₃

NaCl

answer is C.

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Detailed Solution

X can be Na₂CO₃ as the molecular mass of Na₂CO₃ is approximately 106.

Molecular mass refers to a sum of the atomic masses of all the atoms present in a given molecule.

The molecular masses of the given compounds are:

The atomic masses are mostly in decimals so we take the rounded up value for each

CaCO₃ = 40+ 12+ (16×3) = 100
SO₃ = 32+( 16×3) = 80

Na₂CO₃ = (23×2)+ 12+ (16×3) = 106

NaCl = 23+35 = 58

So as observed, the molecular mass of Na₂CO₃is 106.

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