Explain why methylpropane and butane form a pair of isomers.
Identify the kind of isomerism shown by methylpropane and butane.
A sample of butane is heated to $373\,\text{K}$ in the presence of a catalyst and is then left until equilibrium is reached, producing the reaction shown below. $\text{CH}_3(\text{CH}_2)_2\text{CH}_3(\text{g}) \rightleftharpoons (\text{CH}_3)_2\text{CHCH}_3(\text{g}) \quad \Delta H = -8.0\,\text{kJ mol}^{-1}$ State and explain what happens to the composition of this equilibrium mixture when the temperature is increased to $473\,\text{K}$.
Put a $t$ on the graph to indicate the time needed to reach dynamic equilibrium.
Use the graph to determine the concentration of butane and methylpropane in the mixture at equilibrium. concentration of butane = ....................... $\text{mol dm}^{-3}$ concentration of methylpropane = ....................... $\text{mol dm}^{-3}$
Write an expression for $K_c$ for this reaction.
Calculate a value for $K_c$ and state its units.