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A solution containing 28 g of phosphorus...

A solution containing 28 g of phosphorus in 315 g `CS_(2)(b.p. 46.3^(@)C`) boils at `47.98^(@)C` . If `K_(b)` for `CS_(2)` is `2.34` K kg `mol^(-1)` . The formula of phosphorus is (at , mass of P = 31).

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The correct Answer is:
`123.8, P_(4)`
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