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 m
^{3} - 4.5 m
^{3} - 11.2 L
- 11.2 m
^{3}

^{3}^{3}^{3}Hint:

### In the absence of intermolecular forces, water will exist in vapor form.

## The correct answer is: 5.6 m^{3}

### 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 = H_{2}O = 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 m^{3}

Hence, V = 5.6 m^{3}

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