1. How many moles of oxygen will occupy a volume of 2.5 liters at 1.2 atm and 25ºC? 2. What volume will 2.0 moles of nitrogen occupy at 720 mm Hg and 20.0ºC?
3. What pressure will be exerted by 25 g of CO2 at a temperature of 35ºC and a volume of 500.0 mL?
4. At what Celcius temperature will 5.00 g of Cl2 exert a pressure of 900.0 mm Hg at a volume of 750 mL?

answer: mercury

explanation:

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.

c. orbital shape i hope this is correct