A sample of phosphorus that weighs `12.4g` exerts a pressure 8 atm in a `0.821` litre closed vesel at `527^@ C`. The molecular formula of the phosphorus vapour is :

34.5 mL of phosphorus vapour weights 0.0625g at 546^@C and 0.1 bar pressure . What is the molar mass of phosphorus?

When 36g of a non-volatile, non-electrolytic solute having the empirical formula CH_(2)O is dissolved in 1.2 kg of water, the solution freezes at -0.93^(@)C . The molecular formula of the solute is ( K_(f) of water = 1.86 K kg mol^(-1) )

The density of phosphorus vapour at 310^(@)C and 775 torr is 2.67 g dm^(-3) . What is the molecular formula ?

A solution containing 4.0 g of PVC in 2 litre of dioxane (industrial solvent ) was found to have an osmotic pressure 3.0xx10^(-4) atm at 27^(@)C The molecular mass of the polymer will be :

The vapour pressure of a solution having 2.0g of a solute X (molar mass 32 g mol^(-1)) in 100g of CS_(2) (vapour pressure 854 Torr) is 848.9 Torr. The molecular formula of the solute is

Birch reduction : Birch reduction involves controlled reduction of alkynes & atomic compounds in the preseance of alkali metals & alcohol. It provides a method to sterospecifically prepare alkenes of E- configuration R - C -= C -R overset(M,EtOH)to The characteristic type of reaction of alkynes is electrophilic addition reaction like alkenes. The alkynes show various reactions such as halagenation, hydration, hydrogenation etc... 0.40 5g sample of hydrocarbon occupies 229.54ml at 100^(@)C & 1 atm pressure. It decolouses KMnO_4 & Br_2 water. When it reacts with dil. H_2SO_4 under appropriate conditions methyl ethyl, ketone is formed The molecular formula of the hydrocarbon is