1.

The molecular mass of compound is 106 u. Which is that compound?

Answer»

`CaCO_(3)`
`SO_(3)`
`Na_(2)CO_(3)`
NaCl

Solution :Molecular MASS of `Na_(2)CO_(3)` = 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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