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The density of 3 M solution of sodium th...

The density of 3 M solution of sodium thiosulphate `(Na_(2)S_(2)O_(3))` is 1.25 g/mL. Calculate
mole fraction of sodium thiosulphate

Text Solution

Verified by Experts

Wt. of solute `(Na_(2)S_(2)O_(3))=474g.`
Moles of solute `=474/158=3`
Wt. of solvent `(H_(2)O)=1250-474=776g`
Moles of solvent `=776/18=43.11`
`therefore` mole fraction of `Na_(2)S_(2)O_(3)=3/(3+43.11)=0.0063`
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