P = CRT
P = 0.2 atm = 0.2 x 101325 Pa = 20265 Pa
20265 Pa = C x 8.314 x (20 + 273)
C = 8.319 mol / m3
- molar concentration
in 1 m3 (1000000 g) of solution
mass% = 0.05% or 0.0005
M - molar mass of a substance
8.319 x M / 1000000 = 0.0005
M = 60.1
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