At S.T.P. the...

Question

At S.T.P. the density of $C C l_{4}$ vapours in g/L will be nearest to :

5.63

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6.87

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2.34

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Solution

The correct option is C 6.87
According to avogadro's law, 1 mole of every substance occupy 22.4 Liters at STP and weighs equal to its molecular mass.

Thus mass of at STP $= 154 g$

Volume occupied by at STP $= 22.4 L$

Density is defined as the mass contained per unit volume.
Density $= \frac{m a s s}{v o l u m e} \frac{154}{22.4} = 6.875 g / L$

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