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The density of 1 mol of CCl4 vapour at STP is:

1. 6.875 g L^-1
2. 22.4 g L^-1
3. 154 g L^-1
4. 12 g L^-1

Correct answer: 6.875 g L^-1

Solution

The molar mass of CCl4 is 154 g/mol. At STP, 1 mole of any gas occupies 22.4 L. Thus, density = molar mass/volume = 154 g/22.4 L = 6.875 g L^-1.

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