Stoichiometry
1 gm mole of an alcohol whose molecular weight is 74 contains 48 gms of carbon, 10 gms of hydrogen and 16 gms of oxygen. Its molecular formula is

C2H33OH
C₄H9OH
C₃H21OH
(C₂H₄)2H₂.OH

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Stoichiometry
The boiling points for pure water and pure toluene are 100°C and 110.6°C respectively. Toluene and water are completely immiscible in each other. A well agitated equimolar mixture of toluene and water are prepared. If, at a total pressure of one standard atm. exerted by the vapours of water and toluene, the mole fraction of water Xw in the vapour phase satisfies

0.5 < Xw < 1.0
0 < Xw < 0.5
Xw = 1.0
Xw = 0.5

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Stoichiometry
Heat of neutralisation of a strong acid and strong base is always a constant value, i.e., 57 KJ/Kg mole. This is because

Only OH⁻ and H⁺ ions react in every case
The salt formed does not hydrolyse
The strong base and strong acid reacts completely
The strong base and strong acid reacts in aqueous solution

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