1.

A sample of `NaCO_(3)` cotains `6*02xx10^(23) Na^(+)` ions. The mass of the sample is ( at. Mass Na=23, C=12, O=16)A. 53 gB. 106 gC. 165 gD. 212 g

Answer» Correct Answer - A
No. of `Na^(+)` ions = `6*02xx10^(23)`
`:.` No. of formula units of `Na_(2)CO_(3)`
`=(6*02xx10^(23))/(2) = 3*01xx10^(23)`
Molar mass of `Na_(2)CO_(3)`
`=2xx23+12+16xx3`
`= 46+12+48=106g mol^(-1)`
`6*02xx10^(23)` formula units `Na_(2)CO_(3)` has mass
`=106 g`
`:. 3*01xx10^(23)` formula units of `NaCO_(3)` has mass
`(106xx3*01xx10^(23))/(6*02xx10^(23))=52 g`


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