In the reaction n2o4(g) 2no2(g), what changes in color would you expect as pressure is increased at constant temperature?

Brown color of the solution decreases

Explanation:

is brown in color whereas is colorless.

Equilibrium reaction between and is as follows:

As per the Le Chatelier's principle, if pressure of a equilibrium is increased, the equilibrium will shift in the direction having fewer no. of moles of gases.

In the given equilibrium, side has more no. of moles. So on increasing pressure, equilibrium will shift towards the side of or more formation of will take place.

Therefore, more will decompose that will decrease the brown color of the solution as is colorless.

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.