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01/10/2020 5:33 pm
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20 g of a substance were dissolved in 500 mL of water and the osmotic pressure of the solution was found to be 600 mm of mercury at 15°C. The molecular weight of substance is :
(a) 998
(b) 1028
(c) 1098
(d) 1198
1 Answer
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01/10/2020 5:35 pm
(d) 1198
Explanation:
πV = nRT
500/1000 π = 20/m x 0.082 x (273 + 15)
500/1000 x 600/760 = 20/m x 0.082 x 288
m = (20 x 0.082 x 288 x 1000 x 760)/(500 x 600)
= 1198