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T = 200°C + 273 = 473K
P = 740mmHg × ( 1 atm / 760mmHg ) = 0.974 atm
•Gas ideal:
P V = n R T
n = ( 0.974 atm × 20 L ) ÷ ( 0.082atm.L/mol.K × 473K )
n = 0.5 mol