question_answer

A cylinder of fixed capacity (of 44.8 Ltr) contains 2 moles of He gas at STP. What is the amount of heat needed to raise the gas temperature by \[20{}^\circ C\text{  }\!\![\!\!\text{ }R=8.31\text{ }J\text{ }mo{{l}^{-1}}\text{ }{{K}^{-1}}]\]:

A) 966 J               

B) 498 J

C) 831 J               

D) 374 J