23 g of the gaseous compound NO2, were prepared for an experiment. How many molecules of this gas are present? *
6.02 x 1023 molecules
6.02 x 1022 molecules
9.03 x 1023 molecules
3.01 x 1023 molecules

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.

answerlinnaeus;