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(a) Define the following terms : (i) M...

(a) Define the following terms :
(i) Mole fraction
(ii) Ideal solution
(b) `15.0`g of an unknown molecular material is dissolved in 450g of water . The resulting solution freezes at `-0.34^(@)C` . What is the molar mass of the material ?
`(K_(f)` for water = `1.86` K kg `mol^(-1))`

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### Step-by-Step Solution #### Part (a): Definitions **(i) Mole Fraction:** The mole fraction of a component in a solution is defined as the ratio of the number of moles of that component to the total number of moles of all components in the solution. Mathematically, it can be expressed as: \[ ...
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