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Chemistry Question on Conductance

The molar conductivities of KCl,NaClKCl, NaCl and KNO3KNO_3 are 152,128152, 128 and 111 S cm2 mol−1111\, S\,cm^2\, mol^{-1} respectively. What is the molar conductivity of NaNO3NaNO_3?

A

101 S cm2 mol−1101\, S\, cm^2\, mol^{-1}

B

87 S cm2 mol−187\, S\, cm^2\, mol^{-1}

C

−101 S cm2 mol−1-101\, S\, cm^2\, mol^{-1}

D

−391 S cm2 mol−1-391\, S\, cm^2\, mol^{-1}

Answer

87 S cm2 mol−187\, S\, cm^2\, mol^{-1}

Explanation

Solution

difference = 24 S cm2 mol−124\, S\,cm^2\, mol^{ -1}
Molar conductivities of KNO−3=111KNO-3 = 111
Molar conductivities of NaNO3NaNO_3
=111−24=87 S cm2 mpl−1=111 -24= 87 \, S\, cm ^2 \, mpl ^{-1}