## Filters

Q&A - Ask Doubts and Get Answers
Q

# Can someone explain - Chemical Thermodynamics - JEE Main

The difference between $\Delta H$ and $\Delta U$ $\left ( \Delta H-\Delta U \right )$ , when the combustion of one mole of heptane $\left ( 1\right )$ is carried out at a temperature T, is equal to :

• Option 1)

$-4\: RT$

• Option 2)

$-3\: RT$

• Option 3)

$4\: RT$

• Option 4)

$3\: RT$

Views

Combution of Heptane is -

$C_{7}H_{18}\left ( l \right )+11O_{2}\left ( g \right )\rightarrow 7CO_{2}\left ( g \right )+8 H_{2}O\left ( l \right )$

Change in gaseous moles =$7-11=-4$

$\Delta H=\Delta U+\Delta n_{g}RT$

$\Delta H-\Delta U=-4RT$

Option 1)

$-4\: RT$

Option 2)

$-3\: RT$

Option 3)

$4\: RT$

Option 4)

$3\: RT$

Exams
Articles
Questions