as volume is constant
P1/T1 = P2/T2
P1 = 1.00 atm , T1 = 220C = 295 K
P2 = ? , T2 = 2200 = 493 K
P2 = (P1T2 / T1)
P2 = (1.0 x 493 / 295)
P2 = 1.67 atm
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