A solution containing `0.5216g` of naphthalene (mol.wt.`=128.16`) in 50mL of `"CC"l_(4)` shows boiling point elevation of `0.402^(@)` while a solution of `0.6216g` of an unknown solute in the same weight of solvent gave a boiling point elevation of `0.647^(@)` . Find the molecular mass of the unknown solute.

A solution containing 0.2563g of naphthalene (molecular mass = 128) in 50g of carbon tetrachloride yields a boiling point elevation of 0.201^(@)C while a solution of 0.6216g of an unknown solute in the same mass of the solvent gives a boiling point elevation of 0.647^(@)C . Find the molecular mass of the unknown solute.

(a) A solution containing 0.5g of naphithalene in 50g C Cl_(4) yield a boiling point elevation of 0.4K , while a solution of 0.6g of an unknown solute in the same mass of the solvent gives a boiling point elevation of 0.65K . Find the molar mass of the unknown solute. (b) The boiling point of a solution of 0.1g of a substance in 16g of ether was found to be 0.100^(@)C higher that of pure ether. What is the molecular mass of the substance. K_(b) (ether) =2.16K kg "mol"^(-1)