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A compound H(2)X with molar weigth of 80...

A compound `H_(2)X` with molar weigth of 80g is dissolved in a solvent having density of `0.4 g mol^(-1)`. Assuming no change in volume upon dissolution, the molarity of a `3.2` molar solution is

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The correct Answer is:
8
`H_(2)X(M_(w) = 80 g) " Density " = ("mass")/("volume")`
`3.2 M rArr` 3.2 moles of solute is present in (from 1000 ml of solvent)
`" " darr`
3.2 moles of solute is present in 1000 ml of solvent of `(1000 xx 0.4 = 400 g` of solvent) (d= 0.4 gm/ml)
`:.` Number of moles of solute present in 1000 gm. Solvent `= 1000 xx (3.2)/(400) = 8`
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