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Distinguish between molarity and molalit...

Distinguish between molarity and molality.

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Molarity is defined as number of moles of solute dissolved per litre of solution.
Molality is defined as number of moles of solute dissolved per kilogram of solven.
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Knowledge Check

  • The correct relationship between molarity (M) and molality (m) is ( d = density of the solution, in "kg L"^(-1),M_(2) = molar mass of the solute in "kg mol"^(-1) )

    A
    `M=(md)/(1+nM_(2))`
    B
    `M=(m)/(1+mM_(2)d)`
    C
    `M=(1+mM_(2))/(md)`
    D
    `M=(1+md)/(mM_(2))`

  • The relation between molarity (C ) and molality (m) is given by )d= density of solution, M =molar mass of solute):

    A
    `m=(1000 CM)/(1000 C-d)`
    B
    `m=(1000 C)/(1000 d-CM)`
    C
    `m=(Cd)/(1000d-CM)`
    D
    `m=(CMd)/(1000-dM)`

  • The relation between molarity (M) and molality (m) is given by : {p= density of solution (mg/mL)} ('m_1' = Molecular weight of solute)

    A
    `m=(1000M)/(1000p-M_1)`
    B
    `m=(1000pM)/(1000p-MM_1)`
    C
    `m=(1000MM_1)/(1000p-MM_1)`
    D
    `m=(1000M)/(1000p-MM_1)`

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