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Calculate formula unit mass of Na(2)CO(3...

Calculate formula unit mass of `Na_(2)CO_(3).10H_(2)O`

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Formula mass of `Na_(2)CO_(3).10H_(2)O`
`=2 xx ` At. Mass of Na + At. Mass of C + `3 xx` At. Mass of `O + 10 (2 xx ` At. Mass of H + At. Mass of O)
`= 2 xx 23.0 u + 12.0 u + 3 xx 16.0 u + 10(2 xx 1.0 + 16.0)u`
`= 46.0 + 12.0 + 48.0 + 180 u = 286 u`
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