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Asked by lovemaan5500 | 30 Jan, 2019, 11:59: AM

Expert Answer

Given:

Mass of Glauber's salt dissolved = 8.0575 × 10^-12 kg

= 80.57 gm

Molecular formula of Glauber's salt = Na₂SO₄.10H₂O

Molecular weight of Glauber's salt = 322 g/mol

No. space of space moles space equals fraction numerator 80.6 over denominator 322 end fraction space space space space space space space space space space space space space space space space space space space space space equals 0.25 space mol Volume space of space solution space equals space 1 space dm cubed Density space of space solution colon space 1077.2 space kg divided by straight m cubed space Density space equals Mass over Volume Mass space of space solution space equals space space 1077.2 cross times space 1 Mass space of space water space in space solution space equals space 1077.2 space minus space 80.6 space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals 996.4 space straight g We space have comma Molality space equals space fraction numerator No. space of space moles over denominator Weight space of space solvent space in space Kg end fraction space space space space space space space space space space space space space equals space fraction numerator 0.25 over denominator 0.996 end fraction Molality space equals space 0.251 space straight m Molarity space equals fraction numerator No. space of space moles over denominator Volume space of space solution space in space litre end fraction space space space space space space space space space space space space space space equals fraction numerator 0.25 over denominator 1 end fraction space Molarity space equals space 0.25 space straight M Mole space fraction space of space salt space equals space fraction numerator Moles space of space salt over denominator Moles space of space salt space plus space moles space of space water end fraction Moles space of space water space equals space fraction numerator 996.4 over denominator 18 end fraction space space space space space space space space space space space space space space space space space space space space space space space space equals space 55.35 space mol Mole space fraction space of space salt space equals space fraction numerator 0.25 over denominator 55.35 end fraction space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals 4.5 space cross times 10 to the power of negative 3 end exponent space space space space space space space space space space space

Molality = 0.251 m

Molarity = 0.25 M

Moles fraction = 4.5 × 10^-3

Answered by Varsha | 30 Jan, 2019, 16:26: PM

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