If a steel cylinder with a volume of 1.50 L contains 10.0 moles of oxygen, how much pressure per square inch is the oxygen exerting on the cylinder if the temperature is 27.0°C

the answer is definitely c.

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.