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Q.

 0.216g of an organic compound gave 28.8 cm3 of moist nitrogen measured at 288K and 732.7mm pressure. The percentage of nitrogen in the substance is approximately 3x. Then the

value of x is ___ (Aq. Tension at 288K = 12.7mm)

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a

10 

b

20

c

15

d

5

answer is D.

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Detailed Solution

P1V1T1 = P2V2T2

720 × 28.8288 = 76 × V2273

V2 = 72 × 273760

= 25.8

% of N = 2822400 × 28.8 × 1000.216

= 14.93%

= 15% (approximately)

3x = 15     x = 5

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