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49. A cylinder contains n mol of helium gas (ideal monatomic gas) at a temperature of 300 K. The universal gas constant is R (R= ) , where is Avogadro’ number and is Boltzmann’s constant. If the gas is heated at constant pressure, how much energy must be transferred by heat to the gas after it is heated to 500 K?
(A) 200n?
(B) 300nR 
(C) 500nR 
(D) 800nR 
(E) 1000nR

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49. A cylinder contains n mol of helium ..-阿摩線上測驗