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P/T = P'/T'
3/300 = 4/T'
T' = 400°K
Q = U
Q = 3/2 × mol × R × T
Q = 3/2 × 2 × 8.31 × (400-300)
Q = 3/2 × 2 × 8.31 × 100
Q = 3 × 831 = 2493 J