Alightbulb filled with argon gas has a volume of 75 milliliters at stp. how many moles of argon gas does the lightbulb contain?

Explanation:

Volume of gas at STP = 75mL = 75 x 10⁻³L

Number of moles of Ar gas =?

Note: 1L = 1dm³

Number of moles = volume occupied/22.4

Number of moles = 0.075 / 22. 4

Therefore, number of moles = 0.0034mol

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.