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Grade: 12th pass

                        

The mass ofa nonvolatile solute of malar mass 40g/mol that should be dissolved in114g of octane to lower its vapour press.by 20% is......... a) 10 g b)11.4 g c)9.8 g d)12.8 g

4 years ago

Answers : (1)

Vikas TU
13786 Points
							
From partial pressure for non volatile solute formulae:
(P – xP)/P = nA/nB
(P – 0.2P)/P = (w/40)/(114/114)
0.8 = w/40
w = 32 g.
4 years ago
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