Question

When an ideal diatomic gas is heated at constant pressure, the fraction of the heat energy supplied which increase the internal energy of gas is?

• A. $\frac{2}{5}$
• B. $\frac{3}{5}$
• C. $\frac{3}{7}$
• D. $\frac{5}{7}$

Answer 1

Answer: (D)

$\frac{5}{7}$

$f$= $\Delta U$/$\Delta Q$

=$n{C}_v\Delta T$/$n{C}_p\Delta T$

=$C_v$/$C_p$

=$1$/$Y$

$Y$=$7$/$5$ for ideal gas

$f$=$5$/$7$