Chemistry
Grade-9
Easy
Question
If the intermolecular forces vanish away the volume occupied by the molecules contained in 4.5Kg water at STP will be:
- 5.6 m3
- 4.5 m3
- 11.2 L
- 11.2 m3
Hint:
In the absence of intermolecular forces, water will exist in vapor form.
The correct answer is: 5.6 m3
From ideal gas equation, we know PV = nRT = w/m RT
At STP, P = 1 atm and T = 273 K,
w = 4.5 kg and m = H2O = 1 x 2 + 16 = 2 + 16 = 18
Substituting the values,
1 x V = 4.5 x 1000 / 18 x 0.0821 x 273
V = 100.85 x 1000 / 18 = 5600 L = 5.6 m3
Hence, V = 5.6 m3
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