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Heat and Thermodynamics question

2022 · Q169
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Heat and Thermodynamics question

2022 · Q169

NEETPhysicsHeat and ThermodynamicsMCQ+4 / −1

The volume occupied by the molecules contained in 4.5 kg water at STP, if the intermolecular forces vanish away is

  1. A
    5.6 ×\times× 106 m3
  2. B
    5.6 ×\times× 103 m3
  3. C
    5.6 ×\times× 10−-−3 m3
  4. D
    5.6 m3
View written solutionFree

Correct answer: D

From ideal gas equation

$PV = nRT$

$$\left[ {n = {{mass\,of\,water} \over {mol.\,wt.}} = {{4.5 \times {{10}^3}} \over {18}}} \right]$$

$V = {{nRT} \over P}$

At $$STP \Rightarrow T = 273\,K$$

$P = {10^5}$ N/m2

$$V = {{4.5 \times {{10}^3}} \over {18}} \times {{8.3 \times 273} \over {{{10}^5}}} = 5.66$$ m3

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