Question

At 298k the relative pressure of water is 23.75mm hg. calculate the relative pressure at the same temperature over 5%​

Answer 1

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Answer

Let the mass of solution be 100g

Therefore mass of urea be 5 g

Molecular mass of urea be 60g

Xurea = 5/60= 1/12

Mole fraction of urea

Xurea = (1/2)/((1/2)+5.27)=((1/2)/1+(12x5.27)/12)=1/64.24

Using formula

23.75-p/23.75 = 1/64.24

Or 23.75-p = 23.75/64.24

Or p = 23.75-23.64.24

= 23.75(63.24/64.24)

= 23.75x0.98443

= 23.38 mm Hg

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