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t = 27 C = 300 K
m = 5 gram
V = 20 L
R = 0,082 (ketentuan)
PV = mol x R x T
0,5 x 20 = mol x 0,082 x 300
10 = mol x 246
mol = 10/246 = 0,04 mol
Mr = massa / mol
Mr = 5 / 0,04 = 125 gram/mol