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Answer
we know that
for osmotic pressure pi, and concentration c
lim c-> 0 (pi/c) = RT/M
hence from the given data, the following plot is deduced
the equation is as under
pi = 10.77c - 5.5
hence
for extrapolation to 0, the slope is pi/c = 10.77
hence
10.77 = RT/M
T = 25 C = 298.16 K
hence
M = 230.0566016 kg per mol
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