The vapor pressure of benzene is 53.3 k P a at 603 o C , but it falls to 51 .5 kP a when 19 g of a non-volatile organic compound is dissolved in 500 g benzene. The molar mass of the non-volatile compound is

Question

The vapor pressure of benzene is 53.3 k P a at 603 o C , but it falls to 51 .5 kP a when 19 g of a non-volatile organic compound is dissolved in 500 g benzene. The molar mass of the non-volatile compound is, 82, 85, 88, 92

MARKS App · Accepted Answer

P 0 = 53 .3 kPa P s = 51.5 kP a P 0 - P s P s = n N = 19 × 78 M × 500 53.3 - 51.5 51.5 = n N = 19 × 78 M × 500 M = 19 × 78 × 51.5 ( 53.3 - 51.5 ) × 500 M = 85 g

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