Question

One mole of $O_2$ gas is heated at constant pressure starting at $27^o$C. How much energy must be added to the gas as heat to double its volume?

• A. 750 R
• B. Zero
• C. 1050 R
• D. 450 R

Answer 1

Answer: (C)

1050 R

Answer 2

At constant pressure it volume is doubled, temperate gets doubled, $T_{1}=300 k, T_{2}=600 k$ $hence\, \Delta T=600-300=300k$ $Q=nc_{p} \Delta T=1\times\frac{7}{2} R\times300=1050 R$