The equilibrium constant, Kc, for the following reaction is 6.50×10-3 at 298 K. 2NOBr(g) ⇌ 2NO(g) + Br2(g)

If an equilibrium mixture of the three gases in a 18.5 L container at 298 K contains 0.466 mol of NOBr(g) and 0.279 mol of NO, the equilibrium concentration of Br2 is
M.

girl imma just put my comment here because i need a couple point okurrttt

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.